Source (41:43 into the video): https://youtu.be/XongtZXPfao?si=0IL2-_cOwAA3hvnk&t=2503

Will any legacy weapons be added to Zombies?
Happy to say that there are plans in place to bring a handful of those fan favorite weapons back to zombies in a pretty unique way starting in season 3

Time to start speculating I suppose what these weapons will be, and how they'll be added to the game. Personally I have to say that the PPSh and MP40 have to be there.