I am a point where I have little interest in purchasing any new Pentax gear as I feel that I have what I need and my first love is medium format film. The reason I still participate on this forum is for entertainment value such as the rumour threads. I find in funny that people who know Pentax well are still trying to find any rationale behind their naming conventions, Lets see; K10 then the K20 but the K30 does not follow them in the lineup. K7 then K5 then K3 and then the K1 does not follow the K3. K-m then the K-r, surely there are several letters missing between them. 645D and Z are not 645 in size. MX was a film camera but the MX-1 is nothing like it.
I think the only thing we can gleam from the name is that it will probably be a dslr with a K mount and either above, below or replacing an existing camera.