http://reviews.cnet.com/digital-came...-35828459.html
http://www.dpreview.com/previews/pentax-k-3/
Basically, the same sensor as the D7100, but it has some extra low light tweaking, can do one more ISO, has a much faster shutter (8.7fps) but a piss poor battery life if cNet is to be believed. The really interesting thing is the shutter mechanism they are raiting to 200k actuations.
The really cunning thing is the use of the shift mechanism to simulate OLPF.
Has dual SD, which after my drama last year is making me think that is a useful feature afterall.