From their blog post:
Here are a few notable callouts that have come with this update…
Mouse & Keyboard: Improvements have been made to mouse and keyboard input. This includes aiming improvements, enabling red reticle, adding a walk button (which has its own suite of custom options around speed and hold/toggle), and improvements have also been made to the mouse scroll wheel input
Networking & Desync: Improvements have been made to networking, which should reduce instances of “desync.” Vehicles desycning, melee attacks not registering, and blank shots (due to fake reloads) should all see improvements with this update
Player reporting: In-game player reporting has been added to the scoreboard (accessed during a match by pressing the Back button) and post-game carnage report. Players can also be muted from the Back button scoreboard
Sandbox updates: Melee clang logic for the Energy Sword has also been updated—if both players have no shields and melee each other, both players will now trade melees and die in order to prevent the Energy Sword from tearing through teams without trading