Pentax is set to announce their first full frame DSLR by the end of 2015, and the latest suggests that Pentax will use Sony's current 36mp full frame sensor. The camera will apparently also have a high resolution shooting mode, a feature that appears in the brand new APS-C Pentax K-3II.
The K-3 II is the first camera in the PENTAX line to incorporate Pixel Shift Resolution® for capturing still life subjects with ultra-high resolving power. Pixel shift technology uses the camera’s in-body Shake Reduction mechanism to move the image sensor at single pixel increments, capture 4 separate images, which are subsequently combined into a single high definition image. Benefits include higher resolving power, reduced false color and improved overall image quality of non-moving subjects.
This could turn out to be a very interesting full frame option from Pentax.