UPDATE: 10189 Taj Mahal
Brickshelf user whung has a picture showing an upcoming set, the 10189 Taj Mahal. As of now I have no further information regarding this set, but from the box it looks like a general release product, and at almost 6000 pieces, it would be the largest LEGO set to date and would rival the price of the UCS Millenium Falcon set.