There will likely still be differences in the layout and controls..
For one, no ISO button. Of course there is no need for LCD top panel, hardly used for me.
I wonder if they adopt the ol' K20D style menu with the Fn button though... The sole complaint I have about the K5's controls is the silly need to press 2 seconds to switch between select AF point and all the ISO/picture style/timer/etc settings. And I can barely recall which mode I have left it in.