There are no webpage connections to the domain as of yet; Blizzard are just sitting on it. There's little to no reference to 'Blackstone' in any lore created by the studio.
Early this month they launched a bid tofrom its present owner, claiming they bought it only because of Blizzard's Warcraft IP.
Blizzard does seem to have stepped up legal activity on the Warcraft front, which some speculate is pointing toward a revival of the real-time strategy series that eventually birthed World of Warcraft. The studio now controls projectblackstone.com until November 26th, 2013, reports.
Blizzard acquired 'Project Blackstone' domain November 26th
30 November 2012 | By Simon Priest