what was the niburu stuff and would it apply to this new planet?

Wrong section. I think you confused astrology with astronomy.

It was some nonsensical doomsday theory about an outer planet that was supposedly in a decaying orbit heading into the inner solar system. These doomsday theories are a dime a dozen. There was a comet one last year that was all over the internet. If you want to see real near earth orbit objects go to http://neo.jpl.nasa.gov/