Günther Machu made the very first hacked GH2 vs unhacked GH2 versus GH1 comparison. On the his vimeo page you can read the full report. In short: “The 720p60 clearly benefits the most from the hack. The hacked 1080p24 mode shows a finer noise in the dark areas with less keyframe pulsing.”
The hacking is fully ongoing with continuos updateds. Keep an eye on that personal-view forum topic to see more image smaples and user reports.
I still didn’t get many rumors about the next Panasonic GH3. But one thing I noticed is that in US the GH2 is getting cheaper and cheaper. The GH2 with 14-140mm lens is now in Stock with a $250 disocunt at Newegg.com (Click here) ->(found via Noisycamera) and for $1446 on Amazon (Click here).
More links to GH2 product pages: [shopcountry 16254].