Not really a prediction, but here's what I hope:
Some prime in the 150mm range for K-mount would be nice. Make it a limited, and price it to match, if it's fast and good I'll buy
-- probably won't happen, though.
A prime tele for the Q, in the 135-150mm 35mm equivalent range (yeah, sorry, I haven't gotten used to what the Q-focal lengths are). Alternatively, a Q-version of the 50-150/2.8 (high-quality, fast, tele). No "toy" lenses. Might just happen.
A wide prime also for the Q. Something like a 15mm. Rectilinear and autofocus, of course. No "toy" lenses. Could happen.
I actually think that the Q needs a few lenses knocked up a level, and this might be the right time.
Of course, I'm listing things that I'd actually buy in the above
In addition, I hope that Pentax will release/announce whatever it takes to capture market share and sell enough stuff to be able to fund R&D for the few things I care about. If they want my advice on what that will be, they can hire me