Entering the beta is easy. If you backed Wasteland 2 to the tune of $55 or greater, you should have received log-in credentials for the Wasteland 2 Ranger Center. Visit that site, enter your information, and suddenly you're the owner of a Steam key redeemable for the beta. Keep in mind, though, this is only a limited portion of the game, including "the first four major areas ... and related minor maps, along with character creation, world map travel, and random encounters." Developer inXile Entertainment claims that new areas will be added to the beta as time goes by, but in the meantime it has offered a handy guide to all there is to see in the game's current incarnation.
Those who didn't fund Wasteland 2 aren't going to be left out in the dusty, irradiated cold, however. Today's announcement also brings word that the Wasteland 2 beta will hit Steam Early Access on December 13. Access to the Steam Early Access beta won't be free, though by paying for the chance to play Wasteland 2 before its public release, you're helping to fund the game's development. That said, there's currently no word on the price point attached to the Wasteland 2 Steam Early Access beta.