A few quick thoughts on the movie ,
No spoilers tags because these are just my own guesses
Vision , probably a pretty good guess he'll be on Iron Mans side , along with Black Widow , which will match her up against Hawkeye
Black Panther , not real sure what he's doing there , but it looks like he's going after Bucky , my guess is that Bucky did a lot of bad things as an assassin , and the Black Panther has a score to settle with him ,Vibranium will probably also have some to do with it
Ant-Man , my guess is , is that in the trailer you see them taking away Captain America and Falcons stuff , and I'm assuming their going to want to get it back , and Falcon knows a guy , Ant-Man , so my guess is that Captain America and Falcon get Ant-Man to get their stuff back
Spider-Man will be interesting , because Civil War is about the identification registration act , but in the movies , no one really has a secret identity , except Spider-Man , and in these new movies , Peter Parker will only be like 15 years old and still in high school , So I'm sure Spider-Man will play a part on if he wants his identity known or not ,
This movie is already a lot different then the comics , so it'll be interesting to see what they do with Spider-man , who had a huge part in the comic book version of the story
I know a guy