Got this update forwarded from a USGBC rep:
"The updated guidance including group certification (what was Part 2) will be out at the end of October. However, we won't be able to certify projects under that guidance until the first quarter 2012 when the LEED Online portion launches."
Part 2 is described on the USGBC website in this way: "Part 2 (coming in 2011) will contain guidance to help project teams certify a group of buildings as a package where the entire building set will receive a single rating. These buildings may constitute an entire campus or be a subset of an existing campus."