I got a chance to use the GH3 too. I did a very limited test, and I didn't see any moire, see the guy's sweater at the end. I'm confused like larrys, in what situations does the moire show up? I guess I won't really know until I have a GH3 in my hands.
I know YouTube compression will hide it a bit, but that video looks really clean for a 1250ISO video. Also kinda flat (but there's always crushed blacks in the very low end, unlike Canon's Cinestyle), yet it lacks a bit of detail. Perhaps it's about finding a balance in the custom settings.
As for moiré, I watched it twice and didn't find anything, but then again you didn't encounter any difficult textures.
Still, this is getting a bit pointless to me. I want to see a final version of the GH3 head to head against a GH2. I'm tired of looking for ghosts.