A new report suggests that the new Call of Duty 2021 title is WWII: Vanguard.
According to media outlet ModernWarzone, WWII: Vanguard will be developed by Sledgehammer Games and this is still a working title or a code name. This came from their sources that they claim are credible.
The report states that this is a World War II setting and it seems to be that it did not end by September 1945. They revealed that most of the scenes will take place in 1950, but it is still World War II. This could mean it is a fictional timeline or in this case an alternate reality.
The media outlet claims that it will have its own Warzone map and at least the next five years of COD games will have its part in the popular battle royale game. They are assuming that each upcoming title will have a new map that will be added to the battle royale with its weapons ported as well.
Again, take this with a grain of salt for now. No official confirmation that this will be the new Call of Duty 2021 title, but it seems interesting.