According to my German Pentax-Dealer:
- There is no Pentak K3 successor (in 2018)
- The picture does not show a K-70 successor.
My personal opinion:
- A successor for the KP does not make much sense
- The top of the picture is too small for fullframe pentaprism.
Maybe a K-02 (FF?) with electronic viewfinder?
This is very interesting information and the obeservations you made are interesting, too.
No optical viewfinder would mean no mirror box. If they stay with the k-mount (and I don't expect a curved sensor or something like that as the speed at which Pentax rings out new lenses is simply not fast enough to expect an entire new line out of nothing.
I would expect a mirrorless FF camera with k-mount.
What does this mean: The camera can be much smaller as it doesn't need any mirrorbox or pentaprism. But it has to carry the flange typical for k-mount and it also needs some space for the IS/IBIS system. This would define a minimum size for the depth of the camera - but the missing and voluminous parts would allow a smaller design.
The missing pentaprism would reduce the hight of the camera and if the mirrorbox is missing it would allow to put some technial parts more to the border of the way of the light towards the sensor. The camera could be smaller regarding its width.
We would end up with a camera that looks a little bit like a cube - a little bit like a small sized 645z.
My K1 is not too big for me and I like the mirror as protection for my sensor if I change my lenses.
Let's wait for the specifications of the new model if it would be a nice to have or almost a must have for me.
Best regards
Holger