Sledgehammer games adds a new War mode to Call of Duty: WWII. This is a more time driven and story driven multiplayer mode with objectives that you will need to go after as a team.
You'll only get to play one of the battles in War mode, which is described as; "Fight for control of a war-torn French village west of St. Lo, an important operation in the Allied push onward and out of the beachhead at Normandy. Allied and Axis forces battle for control of a strategic manor to secure a forward operating position. Bridge construction, ammo depot demolition and tank escorts are key strategic tasks in this do-or-die mission to dominate the enemy. Choose your equipment wisely – every decision can mean the difference between victory and defeat in this narrative-driven, objective-based multiplayer experience – a first for Call of Duty."
This is going to be a new way to experience Call of Duty and you should try it our during the beta to decide if you like this mode. If so, you will want to find friends to play with as working together will be a major factor in winning. Don't pass up your chance to learn how War mode works in the Call of Duty: WWII beta.