It looks like Call of Duty 2021 alpha testing has begun as developer builds have been spotted both on the PlayStation Network and on Activision’s own Battle.net platform.
As the creator of Blizztack.com, a site that tracks Battle.net games, noted, the studio has codenamed Slipstream on the developer build.
The PlayStation Game Size game tracker also managed to find an alpha build on the PlayStation Network. The files are 35 GB in size.
🚨 Slipstream (COD 2021 Alpha) (PS5)
🟧 Download Size : 35.322 GB
— PlayStation Game Size (@PlaystationSize) July 1, 2021
The Slipstream name suggests that the World War II Call of Duty 2021 rumors are true, as it was the title of a 2008 BBC Radio radio drama set during World War II.