This new rumour is quite plausible: Sony Exmor HD 24 Mpixels sensor (same as Sony Alpha 99's and Nikon D600's), standard zoom to go along, dedicated grip, new flash, announcement during Photokina.
The only odd bit is the one about Sony's exclusivity on the sensor: the Nikon D600 is said to share the same 24 Mpixels sensor and photos of D600 are beginning to float around, see
Ì©¹ú¹¤³§D600. May be Pentax did not want to pay the price requested by Sony to use this sensor from day one?
What makes me cautious is the (supposed) source of this rumour: the OP in the Xitek thread
http://www.dchome.net/forum.php?mod=viewthread&tid=1149840 says 朋友相機店舖職員 which means, if I am not mistaken "
a friend of mine who works in a camera shop". Anyway...