Today at its Hall H panel at San Diego Comic-Con 2012 Marvel announced full titles for Thor 2 and Captain America 2, confirmed Guardians of the Galaxy (including which characters will appear) and revealed test footage for Ant-Man with a surprise appearance by Edgar Wright.
The studio is working on four movies in active development:
Iron Man 3, hitting theaters on May 3rd, 2013.
Thor: The Dark World (November 8, 2013)
Captain America: The Winter Soldier (April 4, 2014)
Guardians of the Galaxy (August 1, 2014) Featuring: StarLord, Drax the Destroyer, Rocket Raccoon and Groot.
Lastly, Edgar Wright displayed test footage for the very first time for Ant-Man.