In a reply to a comment on Facebook, GW said that "Old world stock will be replenished as soon as possible! We will also have news on the next faction to make a return this Saturday."
They have a big preview on Thursday/Friday, but they still keep the ToW for Saturday. I hope it means they have a LOT to announce.
Tomb Kings video is up: https://youtu.be/Dni5AslUJPo?si=D6peZb30llUv1vHh
Edit: here's the article - https://www.warhammer-community.com/2023/12/29/old-world-almanack-the-noble-history-of-the-tomb-kings-of-khemri/
The anniversary miniature is a KO hero: https://www.warhammer-community.com/2023/01/02/celebrate-store-anniversaries-in-2023-with-a-kahl-an-admiral-an-anthology-and-warhammer-swag/