BlizzCon was announced on Monday, and ever since, there's been a question bouncing around the back of my mind: just what is it for? Blizzard doesn't just host an event because they love us or because they feel like it -- they host events to release news. WWI last year was where Starcraft II was announced, and Wrath of the Lich King got announced at the previous BlizzCon.We do know that we're expecting Wrath in "the second half" of the year, and whatever we see at BlizzCon could depend on when that releases. If Wrath appears in August (before BlizzCon in October), we might be seeing the announcement of the next expansion (probably the Maelstrom or the Emerald Dream, or both) in Anaheim: Blizzard has said that they want to release them faster, and there'd be no time like BlizzCon to get an announcement out. If Wrath doesn't show up until November or December, though, Blizzard could use their convention to announce brand new features we haven't heard about yet -- maybe another Hero class?
Of course, we could be grinding the wrong quest mobs entirely -- remember that BlizzCon is about Blizzard, not just World of Warcraft, so anything they announce might have nothing at all to do with their MMO. Diablo 3, anyone? Or maybe they do just want to hang out with their fans and get some good press before the big release. We won't know for sure until they open the doors at the convention center in October.
In addition to all the other info dropping today (apparently Blizzard held an event this last week at their HQ to show off some new 
Blizzard stated that one of the reasons they choose the 
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