The Japanese online magazine Impress interviewed the head of Pentax Ricoh Product Development who said that "a new set of 35mm full frame specifications is being formulated and that new moire removal algorithms are being developed as new in-camera function (which the K-5IIs doesn't have). Besides, a Ricoh brand new camera will come."
On several occasions during the last few months Pentax has been talking about their upcoming full frame camera and I believe it's almost certain that they will introduce some kind of a full frame solution in 2013-2014.
