You'll Have To Wait To Find Out

There's been an ongoing discussion for some time now about the meaning of the Mayan calendar.  The target date is December 21, 2012. at which time, depending on whether you look at the glass as half full or half empty, one of these things will happen:
           

  EITHER

Earth will mark the beginning of a new positive era

OR

The world will end

OR

We will find out that the Mayans had a great sense of humor