Buy for Carenten Map Bonus
So far the only Call of Duty: WWII Season Pass bonus is a new map that you get immediately. When you buy the season pass you get the Carenten map, which is a remake of a Call of Duty 2 map by the same name.
Right now this is the only way to get this map, and it is the only way you can add to your list of playable maps. The trailer above shows off some gameplay in this map. This is a regular multiplayer map and does not include any new War Mode maps to go along with it.