In a newsletter Blizzard reminded all WoW players of the upcoming WoW Cataclysm beta. If you want to sign up for the beta test of Cataclysm, check your Battle.net account and upload your system specs.
Inside your Battle.net account, you can subscribe to beta tests of the Diablo, Starcraft and Warcraft universe:
To participate in the WoW Cataclysm beta test you’ll also have to run a program on your PC to upload your system specs to your Battle.net account. Keep them up to date!