Sad news for you Blizzard fanfolk this morning. There will be no BlizzCon in 2012. The developer revealed as much in an early morning news update that cites a "jam-packed schedule" as the reason for the off year. BlizzCon will return in 2013, presumably with some big announcements to share since Diablo 3, WoW expansion Mists of Pandaria and StarCraft 2 expansion Heart of the Swarm are all expected (maybe "hoped" is more accurate) to arrive in 2012.
This is the second time Blizzard has opted to go dark for a year since the fan gathering launched in 2005, following an off year in 2006. The developer stated at the time that BlizzCon "isn't intended as an annual event," but it's definitely been following a one-per-year schedule since 2007. I'm guessing that most of you would probably rather be playing Diablo 3 and the rest of Blizzard's upcoming slate anyway, so take heart: a year away from BlizzCon guarantees that you'll get to play the new stuff that much sooner!
UPDATE: We reached out to Blizzard to see if they had anything else to add about this announcement but they affirmed that they didn't have any future details to share. A spokesperson for the company said, " We feel that 2012 is going to be an exciting year for Blizzard and our players, and the best way to serve our community is to focus our efforts on our upcoming releases. That said, we’re looking forward to talking more about the Battle.net World Championship in the months ahead."