So I took a special trip into town this afternoon and checked out a G3 in the flesh. To me it felt pretty well built, better than 550d/600d/d3100 & d5100s, but not as good as the d90 and up. But, it does feel plasticky in comparison with the gf1 metal body and not quite as good as the G2.
I actually quite liked the touchscreen and the new menus, especially the new pin point focus thing which isn't present on the GF1. The flip out screen felt safe and secure, with a decent hinge on.
In my hand, it felt quite comfortable, slightly more so than the G2 which was also on display. Shame there are a load of instant access buttons/dials missing from the G2 --> G3 upgrade. Despite IMHO not looking as good as the GF1, it did feel nicer to hold and suited the 14042 kit lens more.
The EVF was OK, and would certainly get rid of those annoying situations in bright light where I'm guessing a little on my framing.
I think I'm pretty close to buying the G3, all things considered. I can re-use my 20mm and 14-42 lenses, and get a decently priced body only G3 deal. The one thing that's holding me back is the battery on the G3. Why do manufacturers seem to think it's OK to upgrade things from one gen to the next, but downgrade the battery?? Whichever marketing genius that thought of that ought to be fired.