Olympus has announced firmware updates for a number of its lenses that will allow them to be used with Panasonic's DMC-G1.
The lenses available for update are the 35mm F3.5 Macro, 25mm F2.8 pancake, 35-100mm F2 and 40-150mm F4.0-5.6. Once they have the new firmware installed, they will be compatible with the Micro Four Thirds G1.
The 25mm pancake and 40-150mm lenses will be able to autofocus after the update, but its not clear if this will be the case for the 35mm Macro and the 35-100mm lens.
When Micro Four Thirds was first announced back in August, Olympus and Panasonic said they would be jointly developing relevant technologies for the standard, and it seems they are sticking to their word.