According to an Amazon item, the beta test for Call of Duty: Modern Warfare 2 may start in August

The commencement of the Call of Duty: Modern Warfare 2 open beta hasn’t been formally confirmed by Activision

Customers are encouraged to “pre-Order Call of Duty: Modern Warfare II for any platform by August 15th, 2022 to unlock early access to the Call of Duty

We can’t yet be assured of when we’ll be able to get our first encounter with Modern Warfare 2 because Activision itself hasn’t confirmed any start dates or timings.

However, the pre-order cutoff date on Amazon does, at the very least, imply that the beta might start on or around August 15.