Ah. My hunch is that Diablo III, StarCraft II, and World of WarCraft will all connect to Battle.net 2.0 servers and have "social" elements shared between all games, much like StarCraft, Diablo II, and WarCraft III do. Why do I think so? Well, because I've seen screenshots of World of WarCraft: Catacylsm people having StarCraft Alpha people on their friends list.
It'll be interesting to see how Bnet2 pans out. I'm really excited since hopefully this will bring around a new generation of bot development. I miss 5 years ago when the large community around vL inspired many (including myself) to learn program. Now, with a new protocol to reverse, and a myriad of new languages replacing VB6 (.NET specifically), it'll be interesting to see what happens.