I am sure that Pentax is/was working on an APS-C mirrorless camera but I don’t know if the plan changed after the Ricoh acquisition. Anyway, here is again a new rumor via dpreview forum: “According to my source, Pentax will release a 35mm full-frame DSLR and an APS-C EVIL (mirror-less) in 2012. No other details were given except that the source seemed to believe the full-frame model will likely use a Sony 24MP sensor.“
The new Ricoh GXR zoom module will use the same Sony NEX-5n sensor. Could be that they will use that sensor for the upcoming Pentax mirrorless camera too?