So the San Diego Comic Con revealed the lineup of Marvel movies leading into the second Avengers movie, with a few new additions. This is the start of "Phase 2" of the Avenger series. Sadly no trailers made it past Comic Con except Man of Steel, so we won't be seeing those for a while
Iron Man 3
Captain America- Winter Soldier (aka Bucky Barnes)
Thor- The Darkest World
Guardians of the Galaxy
So there it is, but no Hulk movie has been announced. But the Guardians of the Galaxy is an obvious reference to Thanos, who we saw at the end of The Avengers.