FF minimal requirements.

My minimal requirements for a Pentax FF DSLR would be:
-24x36mm sensor
-K-Mount
-compatibility with lenses : K, M, A, F, FA (DA), flashes
-1fps
-AF of a range of current Pentax DSLRs
-current amount of camera controls and current MENU layout

-size and weight of a camera not so important (as long as average)
-battery not so important (AAs or proprietary), life not very important
-ImageStabilisation not important
-WR not so important, build quality in a range of current products.

All in all, nothing specially new compared to existing technology!

I think of this like a help to Pentax in designing FF camera.