After Call of Duty 4: Modern Warfare was released, the COD franchise looked set to continue moving forward, perhaps even bringing us to a future war battlefield in future games.
If a job advertisement on the Treyarch website is anything to go by, according to GAMER, then COD 5 may be set during WW II, bringing the series back a step. The advertisement says “if you’re a fan of World War 2 shooters, then even better!”
Treyarch was the team that developed Call of Duty 3, and while that game is often considered as the weakest of the franchise, it's feasible to consider that the company might be willing to try their hands at World War II again.
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Call of Duty 4: Modern Warfare