If you have preordered or bought Wolfenstein: The New Order in retail version before May 26, with the game you should have received a code for access to the closed alpha of DOOM . Please note that Bethesda has now put online the page to redeem your code and subscribe to officially alpha program, which will begin shortly.

If instead you had purchased the game in digital form, always before May 26, then access to Alpha is automatic and tied to your Xbox Live account. Bethesda should inform you at the right time on how to proceed with the download of Alpha.