stoneinapond
Veteran
If I understand you correctly and you're asking what does the GH3 have that the GH2 doesn't, just off the top of my head the things I'm looking forward to are:
3.5 mm audio jack
3.5 mm headphone jack
Separate remote and audio input, so I can have both a remote trigger and external mic. attached
Separate dials for aperture and shutter
OLED LCD and EVF
Weatherproofing
Larger battery
Panny battery grip
Larger body
Don't forget WiFi and Smartphone app functionality
Level and tilt display