Well, I got my mitts on one the other week.
I really like the size and the way it fits in my hands but I do find a lot of little ergonomic niggles bothersome.
Mostly, those little buttons can be vexing and the EV comp dial is a bit too stiff to easily thumb-it while it's up to your eye without using your shutter release finger to assist rotating the dial. Rear control wheel is a little onstructed by a body ridge and the back AF button is similarly awkward with the comfy thumb grip in the way.
Viewfinder is great and the better lenses AF faster than some of my lower end SLR systems.
I'll likely get one simply because I can easily adapt all my old Nikon, Pentax, M42 and other lenses onto it too.
If the buttons aren't improved by then, I can see myself machining and gluing little add-ons to them to make them easier to operate. It would only take about 0.5mm more height on most of them to make them much easier to use, maybe almost 1mm on the AFL button.