That is the last rumour, originated at DCHome.net: a new, full frame Pentax DSLR in the most compact body for this kind of camera, using Sony's 24 Megapixels sensor (to be used in the forthcoming Sony A99) and with a new flash. Apparently Pentax can start using this sensor 6 months after the introduction of Sony model. Price is said to be around $ 2,800, and the camera would be on sale around March 2013. Further information at PhotoRumors.
Whether this makes sense or not, remains to be seen. I personally think that full frame cameras are not the hottest trend in town, but what do I know.