PlayStation 4 users are up first with a beta test from September 12-16 starting at 10:00am PT.
PlayStation Plus is needed in "some territories". September 19-20 are restricted to "early access" players who placed a pre-order on Xbox One or PC via Battle.net, while September 21-23 are open to all players.
The Beta follows a previous, narrower, Alpha test, which gave players weekend access to Modern Warfare's new two versus two mode, with its frenetic gunplay and ultra-short combat rounds.
PS4 owners: If you're a PS4 owner, regardless of whether or not you pre-ordered the game, you can resume and continue to play the Open Beta free for the entire Weekend 2 period (both the Early Access and Open periods). Once they do, though, there will only be an extra ten levels to achieve during the beta and more games modes will be unlocked for all platforms - if the leaker is to be believed.
The second Beta test weekend will begin Thursday, September 19 and will be available to players on Xbox One, PC and PlayStation 4.
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Crossplay will be available for the last two days of the beta and is entirely open. If you don't find the email in either place, or your beta code on the redemption site, reach out to Player Support. Select "Redeem Codes". Enter your Beta Code, and the download will begin.
"Downloading the Beta (PS4): Once you've received your Beta Code, go to the PlayStation Store".
"Downloading the Beta (Xbox One): Once you've received your Beta Code, go to the Microsoft Store".
While the YouTuber has been a reputable source of information in the past, it's best to take everything with a pinch of salt until Infinity Ward themselves reveal what you'll be able to play.
Call of Duty: Modern Warfare will be out for PC, PlayStation 4 and Xbox One on October 25. But yesterday, Activision provided details about the first two beta weekends.
Try out squad combat in the "Call of Duty: Modern Warfare" multiplayer Beta.