Double XP will apply to all modes and maps including Nazi Zombies.
Sledgehammer Games’ Call of Duty: WW2 currently has a double XP bonus on-going for the weekend. You can expect it to end by Monday though the developer has yet to confirm exactly when it will conclude.
The double XP weekend applies to a number of aspects like character and weapon XP. However, it’s active for all the modes and maps including Nazi Zombies. So whether you feel like playing the Zombies campaign and leveling up or grinding Domination for leveling up guns, double XP applies to it all.
Call of Duty: WW2 will be receiving even more content in January for PS4 first with The Resistance DLC pack. The paid DLC will include new maps including Carentan which is available to Season Pass holders at the time of its launch. The Resistance will be available on January 30th and is expected to hit Xbox One and PC a month later due to Sony’s timed exclusive DLC deal with Activision.