May 17, 2013 - Star Trek 2

According to Deadline that the next Star Trek film is slated for May 17, 2013.  This puts it 2 weeks after Iron Man 3 is planned for release.

The other recent rumor is that Benicio Del Toro has been cast as the leader of the Gorn.

http://www.deadline.com/2011/11/star-trek-3d-sequel-will-debut-may-17-2013/