The stunning 3D-capture technology and technique used by James Cameron in Avatar was originally developed by Jackson and Spielberg for this film. Not to mention that two of the greatest screenwriters of our time, Edgar Wright (Scott Pilgrim v. The World) and Steven Moffat (Sherlock), are working together on the script.
The only reason this gets an honorable mention instead of the top billing is that it's scheduled for release December 23, 2011, a mere eight days too early. On the other hand, that's eight fewer days we have to wait.
So there's the list! 12 reasons, plus change, of why 2012 will be one of the best years in recent memory to be a theater-goer. What films are you looking forward to?