Update: Blizzard informs us that if you'd like to a chance to be selected for the StarCraft II beta, this FAQ on Starcraft2.com has all the details.
Blizzard Entertainment sent out an e-mail this weekend imploring media members to set up an account with Battle.net, Blizzard's multiplayer service, in anticipation of the
Blizzard's e-mail had no date for when the beta was going to hit, nor, sadly, did it mention anything about how the general gaming public might participate. At least Blizzard is placing no restrictions on reporting on the beta experience once it does go live. You can expect a flood of details and new media from the game as soon as the beta doors open.