IMAX and Warner Brothers Pictures are locked together for 3-1/2 years
It's true, IMAX and WB pictures came to an agreement that they would release up to 20 files from now until the end of 2013. This arrangement isn't anything that new since IMAX and WB have released 25 films together since 2003. Among the films that will be releases, the next two Harry Potter movies, The Hobbit, Batman 3 and Superman, Man of Steel.
These are the confirmed dates
Harry Potter and the Deathly Hallows: Part 1 scheduled for November 19, 2010
Harry Potter and the Deathly Hallows: Part 2 scheduled for July 15, 2011
Happy Feet 2 scheduled for November 18, 2011
The Hobbit scheduled for December 2012