It will get announced at about 3pm today in our time, or 10pm PDT ( http://www.timeanddate.com/worldclock/city.html?n=137 ) so get excited, kidies!
source: http://forums.worldofwarcraft.com/thread.html;jsessionid=9CC35B8F3DD3F745A220D800022E3DE8?topicId=104561577&sid=1