It is not from any trusted source with any past track record and hence nothing can be verified. But from the details it has provided, this grain of salt is yet somehow specific and interesting!
http://www.dchome.net/forum.php?mod=viewthread&tid=1149840
(in Chinese)
What are mentioned:-
1. Pentax will make the world's most compact Full Frame body which is to be marketed by March 2013;
2. Two body colours, in black and in silver;
3. Using the new Sony 24MP FF sensor, possibly the same one in the upcoming Nikon D600 and Sony A99. However, owing to the agreement between Sony and Pentax, the new Pentax FF has to be put onto the market six months later;
4. A new FF kit zoom lens starting from 28mm wide angle;
5. Together with a new vertical battery grip;
6. And also a new flashgun unit, too!
7. To be sold at HK$22,000 for the body only (equals to US$2820);
8. Will be announced "soon" in September (at Photokina?).
Nothing has been mentioned about the video, though. But are the above already exciting enough? Real or not. :-)
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No Pentax FF This Year if This Rumour is True!