Some users at NeoGAF are stating they received invites and are downloading 2.2GB files.
Have you received a beta build? Let us know - meanwhile, I’ll be contacting Splash Damage and getting a confirmation.
UPDATE: Splash Damage emailed their official reply: This is a private beta under strict NDA and will not be made available to the public or press. The private beta is for technical testing purposes only and not for gameplay evaluation. Should anything change, we will let you know.
In other words, those who received the beta code should not have even said they received one. This is a private beta test.