Back in November Blizzard registered a few domains including projectblackstone.com which is now up. The domain redirects back to battle.net and appears to be a viral site for Starcraft II: Heart of the Swarm. To login you'll need to use the password

Y7_$0>0k_3< $m
(remove the spaces I added before $)

Currently you can only read emails between scientists, however there are other pages on the site that are still locked, so check back to see what else is revealed.