Recently the theme of the next annual Call of Duty title was announced to be World War 2.
We don't know a whole lot yet but the reveal for April 26 at 10 AM EDT. Currently a few pictures have been leaked that allude to the American 1st "Big Red One" Infantry Division and D-Day that landed on Omaha Beach. The focus as of now seems to be the Americans. No mention as far as I can tell of any other battles or factions.
Spoiler Alert, click show to read: