Epic has released a beta of Patch 2.1 to testers, but due to a rather nasty bug, it's advised not to download this patch, as 2.0 clients will not be able to connect if it is installed. That said, here is the current changelist:

UI:
• Disabled wrap for options lists on PC.
• Split out player and bot counts on mixed servers in server browser.
• No longer require double clicking on main menu.
  
  Game:
• No longer disable achievements for mods that don't contain code (maps and custom characters).
• Fixed issues with weapons respawning with Duel and with WeaponsRespawn mutator.
• Reduced visibility of DM beacons in darkmatch.
• Fixed greed exploit with redeemer.
• Updated russian localization. Thanks Michael Sokolkov.
• Removed os helper workaround for Windows 2003 server, now that we have a better fix.
• Fixed low gore issue with Titans.
• Fix for wrong team shader in rare cases.
  
  Server Administration:
• Fixed problem where maplist entries contain unwanted whitespace, and move invalid maplist entries to a separate 'BadMaps' list, instead of just deleting them
• Fixed bug where the advertised game was wrong after switching gametypes, but only for the startup gametype
• Fixed bug with password being removed from URL, during non-seamless travel on the same server
• Fixed bug where the current game profiles mutators would be carried over into other gametypes
• Added 'MapReplayLimit' to UTMapList; this overrides the same value in UTMapListManager, unless set to -1
• Added code to trim down the size of server details results when they become too large, fixes problem where servers would not be advertised
• Adjusted vote code to end vote rounds early, when all players have voted, and to switch map immediately instead of respecting the 'EndTimeDelay' and 'RestartWait' settings
• In endgame votes, forcibly extend the first vote round by 16 seconds (i.e. the time it takes for the vote menu to popup)
• Added admin-only buttons to the vote menu, which allow admins to force a winning vote
• Added logging to track down non-seamless travel client disconnect bug.
  
  Mod support:
• Fixed problem with cooking with -mod and ModShaderCache
• Fixed map makers unable to cook when using Titan Pack assets. (May need to delete GlobalPersistentCookerData.upk from My Games\Unreal Tournament 3\UTGame\Published\CookedPC)
• Added mutator hook for blocking team changes
  
  Level specific:
• Fixed WAR-Confrontation raptor exploit.
• Possible fix for darkmatch memory leak.
• Added refshadercache to patch, so titan content will have shaders compiled.