AMD Socket M2 Update Page: 1
Well, as we already knew, this will utilize DDR2, so no surprise there. Now we learn have that, while it is very similar to current socket 940, it is not backwardly compatible. Finally, we have some bad news. The heatsink bracket for this new socket has been greatly changed. Looks like current heatsinks and such out there will most likely not be compatible.

On another hand, looks like AMD is pushing the release to be before June 30th of this year.