I think that packing all mechanical and electronic components in the current DSLR bodies designed after film cameras makes them really bulky and not very practical to use IMO. There is no film to run from one side to the other so technically DSLR can take any shape, lens mount and pentaprism being the only real physical constraints.
I wish Pentax can recognize this and come up with a K-mount body shaped more like medium format cameras. Current SR, 14MP CMOS, etc, I am OK with all that. A bonus would be to have all that in in improved design, something like Hasselblad H3D:
H3DII-50
I think that "medium format" shape would give much more options to engineers to really put more in it or optimize what is already there: imagine bigger battery, larger SR if necessary, better isolated electronic components to avoid interference, larger LCD, faster CPU, bigger and/or additional buttons and dials for accessing frequently used functions and so on. That would be nice.
Also, what I would like Pentax to offer is a family of P-TTL compatible slave flashes with INTEGRATED radio wireless control.
But again, it is just my dream... :-)