You might check this thread:
https://www.pentaxforums.com/forums/54-pentax-lens-articles/31629-da-lenses-f...ts-thread.html
Short answer is: no one knows for certain.
Longer answer is: K, M, A, F, FA, and DFA series lenses will work. DA series lenses will have to be tested, some will work some will not. Some are derived from FF film designs and will likely work possibly with minor vignetting. Others were designed for APS-C and simply will not work without a lot of vignetting. The thread above is the only real world testing that I have seen. You can assume that DA lenses with very wide focal lengths such as the 16-85, 16-50 and 12-24 and similar will not work.
Of course "work" is open to discussion and someone might be OK with a lens that vignettes badly at 16mm but works fine at 30mm and above. Someone else might not.
I am sure that RIcoh is working quickly to provide a full complement of new lenses that will work even better.