It would be nice to play as a German or Scandinavian or literally anything else then Americans or Main Allies.
In games past, they've done a good job of making multiple theaters, for ex, Call of Duty 2 had 3 fronts, American Rangers, British in North Africa, and Soviets in Eastern Front, and Call of Duty WaW did a Pacific Front which was really fun to play.
Hopefully we'll see multiple theaters besides the stagnant Western front that everyone has played but we'll probably end up playing as a black-transgender-muslim-French resistance fighter