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http://www.geekstir.com/marvel-movies-release-dates
Spider-Man 4: May 6, 2011
Iron Man 2: May 7, 2010
Thor: June 17, 2011
The First Avenger: Captain America: July 22, 2011
The Avengers: May 4, 2012
Marvel continues to love the month of May but shows no love for the Hulk. Nothing had been said for a follow up to The Incredible Hulk.
Gwyneth Paltrow has stated that Iron Man 2 begins work on March 26, while Scarlett Johansson has been cast as the Russian spy/love interest of Tony Stark, Black Widow. Mickey Rourke will be playing "Tony Stark's Russian alter ego, a heavily tattooed bruiser who is in the arms trade and battles Iron Man in his own nuclear-powered armored suit." No word on just which exact villain he'll be playing.
Rourke was also being considered for the villain in Spider-Man 4. I can't quite figure out who he'd play, but I'm guessing we're getting multiple villains again, since signs point to the Lizard playing a part in the story.