The blog that will be the focus of the outreach effort is up, and it links to the actual master planning website.
Another post links to the large online collection of maps of Hanover maintained by the Evans Map Room. One item is a group of 43 topographic maps from stadia surveys of Hanover made by the Thayer School classes of 1903 to 1920, and the maps are amazing. The Larson-era plans for the development of the campus are both thrilling and frightening (ca. 1923?, 1928).
[Update 11.04.2012: Link to planning website added.]