UPDATE: Walt Disney Pictures and Marvel Studios have set a July 26, 2013 release for the sequel to Thor, with Chris Hemsworth reprising the title role. Kenneth Branagh is not returning to direct the follow-up to the film, which has earned $437 million worldwide, though he may produce.
The sequel will be joining Disney and Marvel's Iron Man 3, which was already set for a May 3, 2013 release.
No other film is scheduled for July 26, 2013 yet.