Yes. Nibiru is an imaginary planet which, according to some people who obviously are in dire need of some form of psychiatric treatment, will collide with The Earth in 2012.

I've no doubt that they'll come up with some excuse for why we survive beyond 2012. Probably almost as believable as the one they came up with to explain Niburu's failure to appear in 2003, when it was also due to destroy the world.