While previous Holiday events took place in Infinite Warfare, the new title has been released and as such, all the Winter related content will be taking place in Call of Duty: World War II. This event will run from December 8 to January 2.
The Winter Siege Holiday event will feature:
There will also be five free new weapons that you can unlock by completing special orders (presumably missions or goals) during the siege. Each weapon has its own variants and collection rewards. The trailer details three guns: the Gewher 43, the Sten, and the GPMG. It also seems to imply that there will be 2 new melee weapons: a pickaxe and a knife that has brass knuckles on the handle.