The World of Warcraft community page has been updated with the news that when patch v5.0.4 is released on August 28th, all races will be available to players.
With the release of patch 5.0.4, we’re making all the races of Azeroth playable by anyone, no matter which version or expansion of World of Warcraft they own. This includes the enigmatic pandaren, who will become available for play when Mists of Pandaria is released on Tuesday, September 25. We want the entire World of Warcraft community to be able to embrace their inner goblin, blood elf, worgen, draenei, or pandaren from the moment they step foot into the world of Azeroth.
Thanks to Vannor for the tip!