New submitter JestersGrind writes "Blizzard has announced that Mists of Pandaria, the latest expansion of the popular World of Warcraft MMO, will be launched on September 25, 2012 and can be pre-ordered now."
The game page
has a good deal of information about the new expansion. The level cap is increased to 90, there is a new race (Pandaren) and a new class (Monk), and the talent system has been completely redesigned. They've added Challenge Modes for dungeons, which normalizes player gear and lets them compete to see who can clear it the fastest. The MMO-Champion
website keeps track of all the minor details, if you're interested.