Via HLDS:
Valve- Players who leave a Casual or MvM match for any reason cannot be re-matched intothemthe match in question for a few minutes
- Players who are vote-kicked from a Casual or MvM match cannot be re-matched intothemthe match in question for several hours
- Added Arms Race 3 community medals
- Added FBTF Cup 6v6 Season 4 tournament medals
- Fixed Competitive match history sometimes appearing as empty when connection to matchmaking servers is lost
- Fixed a crash when exiting the client
- Fixed teleporters teleporting players that respawn or change team during the teleport animation
- This fixes an exploit possible when playing on some "instant respawn" community servers
- Fixed the Neutron Star unusual effect being occasionally displaced after the player respawns
- Fixed Rescue Ranger bolts healing disposable sentries in MvM
- Fixed some text in the UI only displaying the first character on OS X and Linux
- Updated localization files
Rumor has it:
- The top two notes were left out originally, vJill stopped by to let people know of it
- Protobuf changes and low-level stuff: https://github.com/SteamDatabase/GameTracking-TF2/commit/309a5a8fe5ce4a184670b11ac70655f49219221f
- /u/sigsegv__ (correctly) suggested that protobufs related to kicking after leaving will solve problems of players dipping from the server and then immediately reconnecting to dodge the kick
- Size is ~10 MB