World of Warcraft Expansion Playable at BlizzCon

Blizzard's official World of Warcraft community website has been updated with an announcement that a playable sneak peek of the game's upcoming expansion pack will be available at BlizzCon. The details:
The World of Warcraft development team has confirmed that BlizzCon attendees will be able to go hands-on with a playable sneak peek of the upcoming World of Warcraft expansion. For those who won't be able to attend BlizzCon, please note that gaming magazines hitting newsstands in different regions of the world around the time of the event will feature in-depth previews on the new content we have in store.

They've also begun selling a limited number of exhibit-only BlizzCon tickets, with more information listed in the latest BlizzCon newsletter.