According to this dpreview forum member, Pentax will release a full frame DSLR and a new APS-C mirrorless cameras in 2012. The full-frame DSLR model is expected to use a 24MP sensor from Sony.
Few months ago Pentax representatives dismissed any future plans for a full frame DSLR since their medium format 645D camera ($9,995.95) can satisfy the need of photographers for better picture quality. Pentax did not completely eliminate the possibility of a full frame DSLR camera and could reconsider if there is a market for such product.
Rumors about a second mirrorless camera from Pentax have been circulating for several months now. Maybe the recent acquisition of Pentax by Ricoh changed their future plans and product roadmap.