60fps @ backward compatibility:
Title Update 1.6.0 for Assassin's Creed Odyssey will be deployed on Xbox One and PlayStation 4: August 24, 2021 at 8am CEST, 2 AM ET, 4 PM AEST, and 11 PM PDT (Aug 23).

Patch Sizes:
- Xbox One: ~370MB
- PlayStation 4: ~470MB

Game Improvement:
- This update adds 60 FPS support when running the game on Xbox Series X|S and PlayStation 5 through backwards compatibility.
Title Update 1.6.0 - 60FPS boost on Xbox Series X|S & PS5 - Aug 24 | Ubisoft Forums