Ricehigh have pubhished something about a future FF Pentax :
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 D600 and 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 a new vertical battery grip;
6. And 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?).
RiceHigh's Pentax Blog: New Pentax FF Rumour