We're getting into that time of the year where the upcoming Call of Duty title for 2021 could be revealed any day now. But, until the reveal is official, we only have leaks and speculation.

Reliable insider and leaker, Tom Henderson, has spotted the upcoming Call of Duty title for 2021 on Battle.net, after it was added to the platform on June 29th.

Of course, the title isn't playable, and simply appears as a developer build with some boring numbers attached. But what is interesting is the codename that appears for the upcoming Call of Duty title, as well as the accompanying logo.

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Call of Duty 2021 Appears On Battle.net

Fans shouldn't get too excited, as the "Slipstream" subtitle is likely to be just a codename and not the official title for Call of Duty 2021. But as Henderson pointed out, the logo for the "Slipstream" codename is very WWII-esque.

This would line up with previous rumours surrounding the Call of Duty title for 2021, most notably that it will be called Call of Duty: Vanguard and set in the WWII era. The title is set to be developed by Sledgehammer Games, who most notably released Call of Duty: WWII back in 2017.

Sledgehammer Games' previous WWII title received mixed reviews, but many praised the Headquarters Hub feature in the game, with fans pleading for the feature to make a return in 2021's Vanguard.

Leaks also emerged recently from Call of Duty leaker, TheMW2Ghost, claiming that the 'London Docks' map from 2017's WWII would be returning in Vanguard as DLC. He also went on to claim that a WWII version of a fan-favourite Call of Duty map would feature in Vanguard.

For now though, all we know is that a new Call of Duty title has been confirmed for 2021 by Activision, and it has now appeared on Battle.net under the codename "Slipstream". Check out the logo below, or head to the Battle.net website to see it for yourself.