I would really like to see a FF digital body from Pentax that has its roots in the old LX film body: small, tight, tough and functional.
A feature I would especially like to see -- and don't really see from Nikon, either, though I keep hearing the D700 is good in this regard -- is a digital body that is designed to play well with old manual focus lenses. The main thing that is lacking is some way to manually focus that's as good as it was on film bodies with split-image viewfinders and microprisms. Accurate focus confirmation -- with some indication which way to turn the lens to get there -- would be fine.
Because of the larger sensor, older lenses won't be pushed as hard, in terms of image quality, as they are on cropped sensors, and I would be perfectly happy to use them.
EVF would be fine. This is the 21st century, after all
Changeable viewfinders would be a great LX-like idea.
What about an LX-D that could actually use the old LX viewfinders?