Usually video game companies do not reveal new games - especially big ones like this - during investor calls, since these are both rather unceremonious and also public. Infinity Ward has made an exception recently, confirming that 2022's Call of Duty game is Modern Warfare 2, a sequel to 2019's reboot of the subline, and will include an entirely new Warzone experience.
Infinity Ward Co-Studio Head Pat Kelly revealed the game in a conference call including developers, investors and content creators, so there was definitely some marketing deliberacy going on, and considering the state of the industry and shaky circumstances of big events and shows, we can't blame them for taking this route.
Maintaining the yearly Call of Duty release schedule at all costs - at least for now, until the Microsoft acquisition goes through - is clearly an important stipulation for Activision, and Modern Warfare 2 has been in development for some time. Rumors and unsubstantiated leaks have already predicted that this will be the next game in the franchise, but now we have official confirmation to back them up.
One of the most interesting tidbits of the reveal is that Modern Warfare 2 will have what was called a "new Warzone experience". Kelly spoke in some detail about a brand new engine that Infinity Ward has been developing for years on which Modern Warfare 2 will be built, alongside this new Warzone experience.

To alleviate many of the integration issues that the post-Modern Warfare games have had with Warzone, instead of extending the battle royale's lifespan further, the company decided that the time for an actual sequel is here. Warzone 2 appropriately launches alongside Modern Warfare 2, just like the predecessors of both.

