The launch of the Speed Booster adapter for Micro Four Thirds has been delayed. Metabones writes: “We apologize but the m4/3 schedule is slipping. Manual focus lenses such as Nikon, Leica R, Contax C/Y, Contarex, ALPA and Rollei will be supported in the second half of 2013. Canon EF lens (but not EF-S) support is planned in the future, but we do not have an estimated date yet.”
The reason for the delay is almost certainly the incredible success of the E and X mount Speed Booster orders. And to better understand why that adapter is so special watch the very well made video by TheCameraStoreTV that I embedded on top of that article!
Here are the links to the lenses you can find on eBay and that will be supported by the Speed Booster MFT adapter:
Nikon F lenses
Contax C/Y lenses
Canon EF lenses