In addition to the K-mount DA lens roadmap that are officially published at the Pentax Imaging website, actually Pentax has disclosed two more lens roadmaps at the CP+ (which is now ended), for the Q-mount and 645-mount lens systems, see these below:-
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(Original source: digitalcamera.jp via DPR post here)
After all, these are not too meaningful, I'm afraid. But, at least Pentax/Ricoh is still publicising "something". :-o