As far as Edward Norton returning as The Hulk, Feige said, "I think there's always a chance. It's certainly our intention to use the same actors from film-to-film where we can."(He's talking about the "Avengers" movie) However, should you be anticipating an The Incredible Hulk 2 you may be waiting a longtime, that is if it happens at all, as Feige added, "That would be post-Avengers if that happened."
I hope they do a sequel, I enjoyed the first movie.