Iron Man 3
Thor: The Dark World
Captain America: The Winter Soldier
Guardians of the Galaxy
- Iron Man
- Captain America
- Black Widow
- Ant-Man (Scott Lang) and maybe The Wasp
- Black Panther
- Ms Marvel or Nova.
Obviously that's a huge team with potentially nine members (unless Marvel surprises us all and kills off one of their major heroes), plus all of the supporting characters. I'd hope some of these characters would leave the team at the end. The obvious member to leave is Tony Stark as Robert Downey Jr. contract doesn't last much longer, but anyone could leave in this film. Nick Fury could even assemble a team without some members because they're not needed to face Thanos. As long as Janet Van Dyne and Thor are there I'm happy (Janet probably won't be so I'm not getting my hopes up).
These are just a few ideas of where Marvel Studios could be heading in the next few years. I might be right or I might be completely wrong (probably the latter). All I know is the Phase 2 is set to be pretty incredible.