Warner Bros is pushing Zack Snyder’s Man Of Steel to June 14, 2013, as opposed to the originally slated December 2012. While there is no official reason yet, it does seem that Warner Bros is trying to take Man of Steel from the December buzz of films (which includes The Hobbit) and move it instead to compete against some other Marvel super hero films slated for 2013.
It is also possible that this has to do with rumors of some issues with the script, although those have not been confirmed.
(via source)
