After 12/21/12, which date will be the subject of the next end-of-the-world hypothesis?

Last year, it was predicted that May 21, 2011 would be the beginning of Judgement and that the world would end in October. Quite a while before that date, however, people had already predicted the next date for the end of the world, which is December 21, 2012. So, chances are that someone has already predicted the next date after 12/21/12. What is it?