Pentax just announced an unusual mirrorless body, the K-01. It continues to use the venerable K-mount, but that also means the mount is still far away from the sensor, to accommodate a swinging mirror that is, ahem, no longer present. What follows is camera-nerdy, and is mainly just a prediction I want to get on record.
Compared to its mirrorless adversaries, the resulting body is thick. Imaging Resource published a preview that has side-by-side pictures of the K-01 against some other cameras, and you can see how much thicker than a small micro-4/3 body this one is. (The Sony NEX was curiously absent from the comparisons, but it's about as thick as a micro-4/3, albeit using lenses that are closer in size to typical dSLR systems, including, ahem, the Pentax K-mount).