A promotional image on Steam may indicate that Call of Duty is returning to the game platform with Modern Warfare 2. Since 2017, new games in the franchise for PC have been released exclusively via Battle.net and thus no longer via Valve’s virtual store.
The image in question was initially featured on the official Black Ops 3 DLC page on Steam and shows the character Ghost, who features in many of the promotional materials for Modern Warfare 2. A user on Reddit commented that this banner refers to the upcoming Call of Duty game, although the image has since been removed. The reference to Ghost and Modern Warfare 2 can still be seen via Google Cache.
It’s far from an official confirmation that the upcoming shooter is coming to Steam, as it could just be due to human error. Even if customers could buy the game via Steam, it is possible that the game will still be started via the Battle.net launcher.
On the other hand, Call of Duty: Modern Warfare 2 is the first game in the franchise to be released since Microsoft took over Activision Blizzard. In recent years, the latter company has produced a variety of first party-games through Steam, including the Halo franchise, the Forza Horizon games, and Sea of Thieves.