In terms of volume of stuff, I'm not sure any games beat Call of Duty's seasonal updates. Black Ops 6 Season 1 is kicking off next week, November 14, and the blog post breaking it all down is so long that I had to read it over two sittings. The density of information makes more sense when you consider that Activison is lumping together both Black Ops 6 and Warzone, the latter of which is getting fully integrated with BLOPS 6's guns, perks, classes, Omnimovement control changes, and gaining a new small-sized map called Area 99.
I'm happy for you Warzone folks, but it's the Black Ops 6 additions catching my eye on the Season 1 roadmap:
