Chipworks dissembled and analyzed the GH2 electronic. You can only read the first part of their article. After that you have to pay to read the rest!
There is a new GH2 review at CNET: “It’s speedy, feature-packed, and an excellent ILC for shooting video, but to consistently get really good photos out of the Panasonic Lumix DMC-GH2 requires shooting raw.“