Basically, the Star Wars Jedi: Fallen Order update improves backwards compatibility performance specifically for the latest generation of consoles. You will find the release notes below. High-Level Summary of Features:

Improved framerate on Xbox Series X|S and PlayStation 5 Improved dynamic resolution ranges, for a higher resolution experience on Xbox Series X|S and PlayStation 5 Improved post-processing resolution for Xbox Series X and PS5. (Not Xbox Series S)

Console Specifics: Xbox Series S

Framerate has been increased to 60 FPS (up from 45 FPS)

Xbox Series X Performance mode

Framerate has been increased to 60 FPS Dynamic resolution added in the range of 1080p to 1440p

Xbox Series X Normal mode (non-performance mode)

Postprocessing has been increased to 4K Dynamic resolution in the range of 1512p to 2160p

PlayStation 5

Framerate has been increased to 60 FPS (up from 45 FPS) Postprocessing increased to 1440p Dynamic resolution has been disabled and the game is rendering at 1200p (up from 810-1080p)