There's a video review of the HPX301E (euro spec version of 300) over at the new UK PanasonicPro-User site here. The guy who put the video review together is an independent DoP called Philip Bloom. I understand he's been an advocate of EX for a while, but has come round to some of the new, cool P2 kit.
There's actually another good link to some very pretty footage taken with the thing too; and I think you can get through to some HD downloadable links too.
I've only just seen this website pop up - i think it's quite recent; but at first glance there's quite a lot of new, and interesting content on it for P2 fans. I'll dig out useful stuff whenever I come across it.