Don't think anyone has eluded to this yet, but my theory for the unmarked right dial is that it might very well be similar to the Silent Multi-Controller on the Sony a99:
I tried out the a99 last year and this was the feature I loved most about it. Basically it allows you to quietly adjust iso, shutter speed, aperture or mic rec level during filming in movie mode (and it can also be used for other functions in photo mode). The only problem I had with it was its placement, you had to fidget it with your left index finger while filming. THIS on the pentax FF, if it does have the same function in combination with the selector dial, would be absolutely perfect positioning for filmmaking. As I don't see a dedicated start/stop button for movie record, I assume the top button on this dial might work as such, or otherwise the green button next t the screen may have that function. And indeed, a touchscreen makes perfect sense.
All in all it looks extremely promising for a hybrid photo-film camera, as long as there is a mic and headphone jack.