The BlizzCon Battle.Net + Starcraft II panel revealed some interesting tidbits about how the new Battle.Net will communicate and interact with not only Starcraft II, but other current and future Blizzard games -- including WoW.
By adding someone to your BNet friends list, you can see when they're online in games that you play. This means that. for example, if your friend Alex Ziebart is playing SC2 and you're in WoW, you'll be able to see that he's online -- and even send him a message if you desire, a la Steam's community overlay.
But wait, there's more! If you and Alex are real-life friends, and approve each other as as much on BNet, you'll also be able to tell more detailed information at a glance on your WoW friends list, like what server Alex is currently playing on, or whether he's actually playing Diablo 3. A proposed feature is to let you log out of whatever game you're in and jump into whatever game Alex is playing and join him! The friends list will work very similarly in all of the BNet-ready games.
It sounds like a great improvement, and very XBox Live -- which I gather is the point.
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