Book your flights now. You have a four-city trip to take if you want to maximize your chances.
Games Workshop will be hosting a number of upcoming events which will give interested people a chance to win a slot in the Warhammer Online beta test. You'll have to physically be present at the events for a chance to win, but if you live in any of the areas where they're hosting these, try your luck!
Get the specifics at Warhammerherald.com.