There is not much I can say except I can not wait till this comes out.

Plot and character profile from Wikipedia

After the events of Avengers: Age of Ultron, another international incident involving Captain America and the Avengers results in collateral damage, prompting politicians to form a system of accountability and a governing body to determine when to call in the Avengers, which results in the fracturing of the team into two opposing factions–one led by Captain America who wishes to operate without regulation, and one led by Iron Man who supports government oversight–while they attempt to protect the world from a new enemy.

Cast

Chris Evans as Steve Rogers / Captain America:
The leader of a faction of Avengers, and a World War II veteran who was enhanced to the peak of human physicality by an experimental serum and frozen in suspended animation before waking up in the modern world. According to Joe Russo, Captain America does not become a disillusioned antihero stating, “his morality is part of his superpower,”[6] and adding, “…there’s an inspirational quality to his character. So it’s nice to have characters around him that he can inspire. Leadership is also a key component of his, and you can’t lead unless you have other characters around. But he’s also got an expanding universe—Winter Soldier, Agent 13, the Falcon—so there’s already a universe that’s expanding around him.” Describing his role in the plot, Evans said, “Tony [Stark] actually thinks we should be signing these accords and reporting to somebody and Cap, who’s always been a company man and has always been a soldier, actually doesn’t trust anymore. Given what happened in Cap 2, I think he kind of feels the safest hands are his own.” On Captain America’s character arc, Anthony Russo said. “The arc we’re tracking for Captain America, the thing we thought would be most interesting with this character when we came on board to direct Winter Soldier was to take him from the most ra-ra company man that you could get, this character who was a somewhat willing propagandist, and by the end of the third film he’s an insurgent.”
Robert Downey, Jr. as Tony Stark / Iron Man:
The leader of a faction of Avengers, and self-described genius, billionaire, playboy, and philanthropist with electromechanical suits of armor of his own invention. On how the character evolves in the film over previous portrayals of the character, Downey said, “It’s natural to change your views. The main thing to me is… what sort of incident could occur and what sort of framework could we find Tony in? The clues are in [Avengers: Age of Ultron] about where we might find him next.” Anthony Russo added, “Tony’s defining characteristic is his egomania, in a lot of ways, and we thought it would be interesting to bring him to a point in his life where he was willing to submit to an authority, where he felt it was the right thing to do.” Marvel initially wanted Downey’s part to be smaller, however “Downey wanted Stark to have a more substantial role in the film’s plot.” Variety noted that Downey would receive $40 million plus backend for his participation, as well as an additional payout if the film outperforms The Winter Soldier, as Marvel would feel the success of this film would be attributed to Downey. Downey’s personal trainer Eric Oram stated that the trick to pitting Captain America against Iron Man, “is to show Iron Man using the ‘minimum force’ necessary to win the fight, and not to look like he’s trying to go wild and kill somebody.”
Scarlett Johansson as Natasha Romanoff / Black Widow:
An Avenger allied with Iron Man, who formerly worked for S.H.I.E.L.D. as a highly trained spy. Describing her character’s situation after the events of Avengers: Age of Ultron, Johansson said, “I think that the Widow’s past will always haunt her. She’s trying to move forward, she’s trying to pick up the pieces of her life. I think we’ll see parts of that in Cap 3 when we find her. And certainly she has a greater purpose, and I think that greater purpose is charged by this need to escape her past. So, it’s always kind of right there, kind of looming over her shoulders.”[16] On the continuation of the relationship between Romanoff and Rogers from The Winter Solider, Joe Russo said, “We thought it would be interesting to take that relationship that was so strong in Winter Soldier, and test it. She sees that they have made mistakes, very public mistakes and she’s trying to convince Steve that it might not be as black and white as he sees it and maybe they have some culpability, and maybe they have to accept that culpability, and then find a way to work within the system so that the Avengers aren’t disbanded.”
Sebastian Stan as Bucky Barnes / Winter Soldier:
An enhanced brainwashed assassin allied with Captain America, and childhood friend of Steve Rogers who reemerged after being thought killed in action during World War II. On how the character continues from Winter Soldier, Joe Russo said the character in Winter Soldier “had the really specific job of basically, you know, being a killing machine and could Cap crack the veneer of that well formed Hydra killing machine? So what’s left to explore obviously is the personality of the character, much the way that [Ed] Brubaker’s run did after Winter Soldier regained a semblance of his past. Philosophical questions that we would want to deal with in Cap 3 would be, you know, is he redeemable? Is he the worst assassin we’ve ever seen or is he the longest suffering P.O.W.? Where does he live now? Does he ever regain his memories? If he doesn’t regain his memories, can you call him Bucky Barnes or is he somebody new? So it’s a really fascinating character to play with. Very rich.” Stan stated he had more lines in the film over his appearance in Winter Soldier, and how that applied to the development of the character, he said, “The look of the Winter Soldier is a very specific look. There was something very specific in how the guy looked and behaved and I felt like the more I stepped back and I just kind of let that do the work, the better it was gonna be. In a situation like that, you’re trying to guess where the guy’s at in his mind, and that certainly continues in the Civil War movie. You’re always trying to guess what side is he on or … because he can go both ways.”
Anthony Mackie as Sam Wilson / Falcon:
An Avenger allied with Captain America, and a former pararescueman trained by the military in aerial combat using a specially designed wing pack. Discussing the relationship between Wilson and Rogers, Mackie said, “With Falcon and Cap, what’s so great is there’s a mutual respect. There’s a soldier respect. What’s great about… [Captain America: Civil War] is you get to see their relationship grow.” “He’s deepening his relationship with Cap,” says Joe Russo. “It’s Falcon, Cap and Bucky – how is that dynamic going to work going forward? How does he feel about Bucky? How does it alter his relationship with Cap if Winter Soldier comes back into the picture?”
Emily VanCamp as Sharon Carter / Agent 13: A former agent of S.H.I.E.L.D. allied with Captain America.
Don Cheadle as James “Rhodey” Rhodes / War Machine: An Avenger allied with Iron Man, and an officer in the U.S. Air Force who operates the War Machine armor.
Jeremy Renner as Clint Barton / Hawkeye:
A master archer allied with Captain America, who previously worked for S.H.I.E.L.D. and the Avengers. On how he and Hawkeye fit into the Marvel Cinematic Universe, Renner said, “I’m happy to be the ensemble. I’m not scratching or clawing to do a solo movie by any means…I think [Hawkeye’s] a utility guy that can bounce around into other people’s universes a little bit, especially like Cap 3.”
Chadwick Boseman as T’Challa / Black Panther:
The ruler of the African nation of Wakanda who allies with Iron Man. On including the character in the film, Feige said, “The reason we introduced him in Civil War is because we needed a third party. We needed fresh eyes who wasn’t embedded with the Avengers and who has a very different point of view than either Tony or Steve. We said, ‘We need somebody like Black Panther… why don’t we just use Black Panther?’” Feige also said that T’Challa would be in the “beginning phases of taking on” the Black Panther mantle. On landing the role, Boseman said, “It wasn’t really an audition process. It was more of a discussion about what they wanted to do and how I saw it and what I wanted to do. It was more of a feeling out process”. Boseman has a five picture deal with Marvel.
Paul Bettany as Vision:
An android and Avenger allied with Iron Man, that was created using the artificial intelligence J.A.R.V.I.S. and the Mind Stone. Describing his preparation for the role, Bettany said, “I was given comics. I also was looking to think about what could be edifying for me to learn. I took the opportunity – you see my character get born… He must be both omnipotent and yet totally naive at the same time. And experiencing the world in real time and his place in it. Is he going to be a force of good or a force of evil? It was really interesting, fun to play with, because he’s dangerous, you don’t know if he’s going to go one way or another. I’m continuing that theme in Captain America 3.” Bettany also said he was interested in exploring “what it means to be human and what love is” with the character, as “The only way one can guarantee one’s loyalty is love.”
Elizabeth Olsen as Wanda Maximoff / Scarlet Witch:
An Avenger from the Eastern European nation of Sokovia, who can harness magic and engage in hypnosis and telekinesis. Describing Scarlet Witch’s role in the film, Olsen said, “She’s doing alright. She’s confused, she’s conflicted. She’s found some people she thinks she connects with, but she’s doing alright. They released images of Team Cap and Team Iron Man. She wasn’t there. She’s always the wild card. I like being the wild card.” According to Olsen, the character is “coming into her own and starting to understand and have conflict with how she wants to use her abilities. It’s a dramatic conflict within her and obviously there’s conflict within the [Avengers] as well.”
Paul Rudd as Scott Lang / Ant-Man:
A former petty criminal allied with Captain America, who acquired a suit that allows him to shrink in scale but increase in strength.[1][37] Ant-Man director Peyton Reed revealed that he had discussed the character and the way that the Ant-Man production had shot certain sequences with the Russo brothers, saying, “As we were doing the movie and we were in post and they were getting ready to head out to Atlanta to do Civil War, we had a lot of conversations. And I actually wanted those guys to come in and look at our stuff, because there’s gotta be a lot of sort of crossover. I found myself getting extremely protective over the character of Scott Lang and talking to the guys, the writers, the Russo’s [sic] about, ‘He wouldn’t do that.’ It’s important because there’s this continuity that has to happen in this universe.”
Frank Grillo as Brock Rumlow / Crossbones:
Former commander of S.H.I.E.L.D.’s counter-terrorism S.T.R.I.K.E. team, who was revealed to be an agent of Hydra. On returning to the character, Grillo said “He’s a badass. He is just vicious. I like the idea that it’s no holds barred. I was 15 pounds bigger when I did Cap 2, and I’ll put another 15 pounds on to do Cap 3. I love the physicality. It changes the way you look; it changes the way you feel.” However, he cautioned that “This movie is such a big movie with a lot of people in it, so you don’t get as much of the time that you’d like to have. But, it’s all good. We’ll see what happens.”
Daniel Brühl as Helmut Zemo:
A brilliant and sadistic scientific genius working for Hydra. Zemo does not wear his signature mask from the comics, with Brühl stating the version appearing in the film is “loosely connected” to the character from the comics. He went on to say that was a reason he liked Marvel, as “some of the characters and things they’re dealing with always reference to current events so my character is from a different area than you would think.” Brühl also said that Zemo may also appear in future MCU films.
William Hurt as Thaddeus “Thunderbolt” Ross:
The United States Secretary of State and former U.S. Army general dedicated to capturing the Hulk. Hurt, on returning to the MCU said, “…what [the writers have] done is they’ve taken a character who was the Ross from [the Hulk movie] and made… a more modernized style.” Director Joe Russo says of Ross, “The job is to tie all these films together. To be able to pull from [The Incredible Hulk], which may have been forgotten about a little bit, and make it relevant again within the cinematic universe, is important to us. We thought it would be interesting to take a character who had a fanatical anti-superhero point of view. Now he’s become much savvier and more political and has put himself in a position of power, not unlike a Colin Powell. He’s cornering the Avengers politically now, he’s out-maneuvering them.”
Additionally, Tom Holland has been cast as Peter Parker / Spider-Man, a teenager who received spider-like abilities after being bitten by a genetically altered spider. Feige said that Spider-Man would be torn between superhero ideologies, saying, “Does he want to be like these other characters? Does he want nothing to do with these other characters? How does that impact his experience, being this grounded but super powerful hero? Those are all the things that Stan Lee and Steve Ditko played with in the first 10 years of his comics, and that now we can play with for the first time in a movie.” Holland is signed on for at least three films, not including his Civil War appearance. Martin Freeman has been cast in an unspecified role, which he described as someone who “works for the American government…[and] works in conjunction with the superheroes, and certain agencies that help to tame the superheroes’ power”. Stan Lee makes a cameo in the film.