My quick impressions:
This is a preproduction model, so there were parts that weren't fully up to spec, but the hybrid viewfinder worked very nicely with a red overlay to show shooting information. The eyepiece has a proximity sensor to auto-switch from the VF to LCD as appropriate. Looking through the optical viewfinder without seeing a rangefinder patch was very disconcerting.
The build is very nice, feeling more solid than the GF1, but nowhere near the machined metal casing of the Leica X1. There's a very subtle hand grip, mild but effective, on the front of the camera. The black material that wraps around it is slightly yielding and very nice to hold. The lens is quite small, and the balance is entirely within the body.
The camera is essentially silent in operation. Its shutter is about the same volume as a compact P&S. It's just a quiet little 'snick' that makes my GH1 sound like a firecracker.
In short: the people who want to like this camera are going to have plenty of reasons to keep liking it, while those who don't 'get it' will continue to not understand what the big deal is.