Re: Changing the roster for Avengers 2?
I think they'll just add instead of rotate. Cap, IM, and Thor will stay. The only way I see the Hulk leaving is if he turns on the Avengers, which I highly doubt after the end of the first film.
Panther, Ant Man, and Wasp are locks. Vision and Ms. Marvel are probables.
Arrive. Bash Topher. Leave.