The more I read the more I'm starting to be convinced it's going to be usable up to ISO400.
According to this mini review the:
Image quality was excellent, even at ISO 400 when most compacts start showing unacceptable noise
Panasonic has their official page up now. It certainly delivers the goods at ISO80 if nothing else:
http://panasonic.net/pavc/lumix/popu...3/P1010271.JPG