Originally posted by falconeye 59mm is what I read.
As I posted, this is very close to the K-x depth (63.5mm) if you measure mount to LCD.
Moreover, if the lens offerings are pancakeish small, then the decision has been made NOT to compete on body size a la NEX and m43, but focus on small, fast glass while retaining backwards compatibility.
Mount depth does not make or break consumer appeal because on virtually all of these systems, once you add a lens, the camera is nowhere near "pocketable" (and oversold concept appealing to many fewer consumers than the rhetoric would have us believe).
This is mostly about EVF vs. OVF, video, and the other benefits of mirrorless, without getting into a size war.
All hypothetical of course, but certainly a lot better than the costly Ricoh module concept.