According to the predictions, we are one year away from the date the ancient Mayan Long Count calendar supposedly marks as the end of an era and the end of humanity. Many archeologists argue that the 2012 reference on a 1,300-year-old stone tablet only marks the end of a cycle in the Mayan calendar. Perhaps others have added "the end of humanity"...seems so many of us are attracted to apocalyptic ideas and always assume the worst. Although it is interesting to try and interpret the writings of ancient civilizations, I believe 12/21/12 will be the Winter Solstice for 2012...nothing more.
The History channel has more information: