The movie 2012 is now available for purchase, but you only get the "definitive" edition with the 2-disc Blu-Ray DVD set. (relevant-to-the-comm's-interests parts bolded.):
http://www.sonypictures.com/homevideo/2012/specialfeatures.html
* DELETED SCENES
* ALTERNATE ENDING
* ROLAND EMMERICH: Master of the Modern Epic
* COMMENTARY - with Roland Emmerich & Harald Kloser
* movieIQ™
* PICTURE-IN-PICTURE - Roland's Vision
* "TIME FOR MIRACLES" Music Video by Adam Lambert
* INTERACTIVE MAYAN CALENDAR
* MYSTERIES OF THE MAYAN CALENDAR
* DESIGNING THE END OF THE WORLD
* SCIENCE BEHIND THE DESTRUCTION
* THE END OF THE WORLD: The Actor's Perspective
* COUNTDOWN TO THE FUTURE
* MAKING THE MUSIC VIDEO "TIME FOR MIRACLES" With Adam Lambert
* Digital Copy™
The regular DVD version only has the "Time For Miracles" video, not the making of feature.