Well folks, the cat is out of the bag. Apparently IGN slipped when showing a preview of the Jace Hall Season 3. In it, you can clearly see a screen that says "Welcome to the StarCraft II beta". The show is set to air on January 29th, which just so happens to be the day after our submissions for the beta keys are due.
source:incgamers.comEdit: This has been confirmed on Blizzard's twitter page
http://twitter.com/StarCraft