I've been aware of December 21, 2012 for decades. End of the current, and final, Mayan long-count calender. Amazingly, they knew of Precession - a full galactic rotation, which is what the long-count calendar was based on. Their advanced knowledge of astronomy and mathematics is dumbfounding. I find it almost incredulous that an ancient civilization could have developed such advanced knowledge in those areas without help. And yes, I mean help from Visitors....
The mythology behind the Mayans and the calendar is mesmorizing (sp?).
Do I believe in it? Half of me does. Okay, more like 30% of me does. But I would not be surprised either way at what happens on that day.
As for the film, haven't seen it, but want to.....soon as I get a job....