Having owned this camera for several weeks now, I'm very impresssed by what Nikon has put together.
Before purchase I was nervous of the sensor size debate etc etc, but after using the camera and the 10mm, the 10-30mm, and the 10-100mm I do think that the tradeoffs are well thought out.
Quality of build is excellent; The viewfinder is very nice, and gives a very responsive and useable alternative to pocket cam handling. Some friends who handled it commented on its "Leica-ness".
Focus is excellent, truly outstanding.
Image quality is very good out of the camera.....
Overall : I like it!
Fixable by firmware update - ability to turn off the post-capture 1 second image review would be nice
Fixable by firmware update - live histogram
Not fixable by firmware - manual focus mechanism