Pentax signals Full Frame in video interview at PentaxForums
PentaxForums interviewed Pentax at CP+ and the Pentax interviewee signaled that the Pentax hierarchy is embracing full frame digital cameras. This was a pre-scheduled interview, so we can be certain the Pentax guys were very careful about what they were saying. In other words, it wasn't a "slip of the tongue" type of a thing. PFF speculates an early 2014 announcement.
You can also find the interview YouTube-embedded right below (watch full screen if the YouTube progress bar or YouTube-Adsense are blocking the translated sub-titles).