Betelgeuse might already have gone supernova, and if it did the light might reach us in 2012 depending on the accuracy of our measurement of it's distance from earth. For a while Earth will be illuminated with two suns and a beneficial shower of neutrino particles.
This event (should it occur) would tie in nicely with Mayan predictions. For more information read this article from Gary A. David.
For more fun facts check out the website TheOrionZone