Pop Photo Editors have speculating about future pro-grade Pentax DSLR based on the full frame sensor that is probably in development by Samsung:
Pentax We have heard talk of a new pro level camera in the works. The next big offering from Pentax is likely to have improved noise levels and include a full-frame sensor from Samsung.
Samsung The company isn’t likely to make its own DSLR, as its consumer market is more in the big-box and electronics stores. The company probably will continue working closely with Pentax. A full-frame sensor for a Pentax DSLR is likely in the works.
Such rumors are floating around for more than a year, but the sources are becoming more and more credible.