There are also threads linked for German, Spanish, Portuguese, and Italian players, with a French thread on the way. So get out there and enter some sweepstakes. There's nothing to lose and a possible Mists of Pandaria beta slot to win.
If you're an annual pass subscriber, however, you should already have access to the beta. Just head over to your Battle.net account page and check for the Mists of Pandaria beta account. From there, you can download the client and log in to start experiencing all the beta fun.
It's open warfare between Alliance and Horde in Mists of Pandaria, World of Warcraft's next expansion. Jump into five new levels with new talents and class mechanics, try the new monk class, and create a pandaren character to ally with either Horde or Alliance. Look for expansion basics in our Mists FAQ, or dig into our spring press event coverage for more details!