IF you somehow would manage to hack the GH2 do you think you would be able to add 50/60p @ 1080? Since that is what the sensor outputs.
Damn, how many times are you going to ask that? The camera isn't even out yet and you want to know when the hacked firmware will be ready? Heck the Panasonic firmware isn't even really finalized yet. What makes you think he can hack it before they even finalize it?
What exactly are you planning on doing with 1080p @ 50/60 FPS? You can't stream it. You can't really burn it to a Blu-ray. You can't play it on most computers. Plus it will not have a high enough bit-rate to prevent artifacts. So what is this urgent need you have for 1080p @ 50/60 FPS? Do you want to do slow motion? Then use 720p @ 60 FPS. It is more than capable of producing excellent slow motion shots. Heck, even the 720p @ 30 FPS on my GF1 works for slow motion.
http://www.youtube.com/watch?v=kznlP83ISFI&hd=1
If you really have a need for 1080p @ 60 FPS then buy the Panasonic camcorder that does it. That camera is designed specifically for what you need. Otherwise you will just have to wait.