Panasonic press release, this morning:
Panasonic is pleased to announce two new mount adaptors, the M Mount Adaptor DMW-MA2M and R Mount Adaptor DMW-MA3R, to further enhance the photographic experience with cameras from the Lumix G Micro System.
The M Mount Adaptor and R Mount Adaptor are developed under support of Leica Camera AG, making it possible to attach Leica M lenses (DMW-MA2M) or R lenses (DMW-MA3R) on DMC-G1 and DMC-GH1. Users can enjoy outstanding image rendering offered by the combination of high quality Leica lenses and Lumix G cameras that are full of Panasonic's cutting edge digital technologies. These adaptors also allow users to use the movable MF assist function, which enlarges the selected area when focusing manually.
The compatibility information of Leica M/R lenses are on http://panasonic.jp/support/global/cs/dsc/