As noted in this Battle.net forum post, Blizzard will start taking signups for the World of Warcraft at the end of the month. It is also mentioned the company is currently alpha testing the game internally and with a small outside group, unfortunately a test version of the game has hit the net thanks to one of these people ("While these files contain alpha content from the game, they are not fully playable and therefore do not convey the experience that World of Warcraft will provide when it is released"). Thanks Worldofwar.net.