Well if StarCraft II's beta is to be released at the end of the year, then the game will be at BlizzCon for sure.
The report also claims that Blizzard plans to shut down its original StarCraft servers in order to ensure the success of the sequel.
Let's see - first off this looks like just a rumor, but if it is true, then Diablo and Warcraft (not WoW) would be the last games left on Battle.net. It would be logical to guess that Diablo and Warcraft would need to get a sequel as well in order to make them worthy of new servers.
It doesn't seem logical for them to drop StarCraft I entirely. Perhaps they could keep the old games on Battle.net, and the new games on Battle.net 2 (beefier, more reliable Battle.net)
EDIT: Oh and by the way - I don't think Blizzard needs to ensure the sales of StarCraft II. I'm just saying...