They said they have 5 movies in the works but only announced 3.
1. Iron Man 3
2. Thor 2
3. Captain America 2
Candidates: Black Widow, Ant-Man, Hulk 2, and Avengers 2.
Sidenote: I read an article (and can't remember where) that said that Marvel claims they won't use Hulk for anything other than a member of the Avengers in the Avengers movies from now on. Which kinda sucks.
theres a rumor of a Guardians of the Galaxy moive too. +its understandable why they dont want Hulk to play alone.