Blizzard has begun the World of Warcraft: Cataclysm private beta. What luck, I was not one of those chosen to participate in the beta—at least not yet! You can find out if you’re in the beta by going to battle.net and managing your games. If you see Cataclysm waiting for you, have at it!
Being 2010, someone (WoW Insider, natch) is playing the beta on live on Ustream. As of this writing (11:00am ET) I spy a Worgen (can’t tell the class) running around killing things.
MMO-Champion has a lot of information on the beta, more than you can possibly consume.
Oh, to play as a Worgen. That is life at its richest.