http://panasonic.jp/support/global/cs/dsc/
“Firmware version 1.1 for the Panasonic GH1 camera allows faster burst shooting and improves control of shutter speed and the stability of AF in movie recording. Version 1.3 for the Panasonic G1 improves its compatibility with Micro Four Thirds lenses, whereas firmware version 1.1 for the Lumix G Vario HD 14-140mm / F4.0-5.8 ASPH. / MEGA O.I.S. lens improves optical image stabilisation in movie recording mode.and compatibility with Micro Four Thirds cameras.“