You know... it's really quite amazing at how much information isn't researched on the Internet. A couple of friends and I were talking about Blizzcon 2010 and trying to figure out who may or may not be going again this year. Keep in mind, there's no official date as of yet, but apparently BlizzPlanet did their research last week on the schedule of events at the Anaheim Convention Center. Wow.com picked up the story and ran with it, again using the same dates that BlizzPlanet did. And I'm sure there's at least a dozen other sites that have ran with this same information. (I'm a wee bit behind in my feed reader.)
So, per BlizzPlanet, the date will be August 20th and 21st, 2010. Okay... makes sense. The last scheduled date at the convention center is 8/13 and the next event is 8/26. Furthermore, Blizzcon was August 21st and 22nd in 2009. But what's wrong with October 22nd and 23rd? The last scheduled date there is 10/16 and the next one is 10/30. And Blizzcon 2008 was in October.
Now I'll give BlizzPlanet a break that maybe the Anaheim Convention Center changed their schedule from last week to this week. Web pages can change, so unless somebody got a screen shot, we'll never know what it was last week. And maybe Wow.com even did their on analysis on the Events Page as well... who knows.
But really, it's more fun to speculate, right? So, other possible dates: 11/12-11/13. (Which I think is probably too late in the year, but maybe I'm wrong.) Further trends: Each time they've done Blizzcon it's flipped between October and August. From Wikipedia: Blizzcon 2005: October. Blizzcon 2007: August. Blizzcon 2008: October. Blizzcon 2009: August. Blizzcon 2010: October? I'm not placing any bets, and I've got plenty of time to arrange my airline tickets. ;)