Microsoft has announced their Games with Gold "free" games for January 2022 already. I assume this early announcement is due to those silly things like Christmas and New Years coming up at a rapid rate.
These games will start to be available starting on January 1, 2022. The games include NeuroVoider, Aground, Radiant Silvergun, and Space Invaders Infinity Gene. As always, these games are "free"...