Disney and Marvel Studios have set release dates for two as-of-yet unnamed movies for May 6th 2016 and May 5th 2017.
The month of May happens to be when Marvel Studios releases their "big" movies as both The Avengers and Iron Man films have been released that month.
It's quite possible one of the dates could belong to either The Avengers 3 or Iron Man 4.
The Avengers 2 assembles May 1, 2015 with Iron Man 3 on May 3, 2013, Thor: The Dark World on November 8, 2013, Captain America: Winter Soldier on April 4, 2014, the Guardians of the Galaxy movie on August 1, 2014 and Ant-Man on November 6, 2015..
Head on over to the Cosmic Book News The Avengers Movie Hub for more news, images and trailers.