The next Avengers movie has an official release date of May 1, 2015. Sure, it is a few years off but I would rather them take their time and do another awesome movie than rush a sequel out. Joss Whedon has also been signed to write and direct the sequel which is good news since he did such a great job with the first one. Before the Avengers 2 movie comes out, the following Marvel movies will come first:
Iron Man 3 on May 3, 2013
Thor: The Dark World on November 8, 2013
Captain America: The Winter Soldier on April 4, 2014
Guardians of the Galaxy on August 1, 2014.
No mention of another Hulk movie but you can never give up that there will be another one!!!