I saw a roadmap on another forum, but I can't find it now. I just hooked this from the Panasonic web site, though:
"Panasonic Announces the Expansion of HD Lens* Line-up and the Firmware Update Program for the Interchangeable Lenses of LUMIX G Micro System.
Panasonic has set a new standard for the camera’s performance of auto focus and its silence performance for users to fully enjoy HD video recording. The following seven lenses clear this standard to be introduced as the HD Lenses.
*HD Lens is a high performance interchangeable lens that realizes high quality video recording. The lens excels in the performance of tracking focus in video recording while offering silent auto focus and exposure control."
News - Latest News - HD Lens Firmware Update - Panasonic UK & Ireland