Server - Some potential sources for lag/rubberbanding have been eliminatedServer - The old reserved slots has been replaced by a kick-on-demand system like in BF2Server - Log file for server admins: all remote admin interface commands/events are loggedServer - Log file for server admins: major server events + all chat messages are loggedServer - Idle kick is controllableServer - Profanity filter can be disabledServer - Teamkill-kick system is controllableServer - Ticket counts and bleed rate are controllable per-levelServer - Infantry only mode available per-levelServer - Initial spawn delay and respawn delay are adjustableServer - Server description can be up to 400 characters, and use "|" for line breaksServer - Banlist can contain up to 10.000 entriesServer - reduced latency in packet handlingAdmin Interface - fixed the player.onKill spam that occasionally happenedAdmin Interface - ensured that player.onJoin events always report the player nameAdmin Interface - events triggered when people spawnAdmin Interface - much more info on killsAdmin Interface - detailed stats are reported at end-of-roundGameplay - Various minor level bugfixesGameplay - Helicopter handling has been tweakedGameplay - Weapon tweaks have been implemented based on PC public feedbackGameplay - Tracer dart gun speed has been changed from 300 m/s to 200 m/sGameplay - Fixed technical hang when a crate was armed outside of the combat areaGameplay - "Victory is near" message was shown for the wrong team on Valparaíso, this has been fixedGameplay - Countermeasures can be fired when driving a helicopterGameplay - The brightness of the pilot view in the Russian helicopter has been reducedGameplay - Advanced Spotting scope works betterGameplay - Knifing people in the back works again (we backed out the change that we had done for Server R11)Gameplay - Hit box for moving targets expands based on the speed of the targets movementGameplay - G36 now has crosshair when in Hardcore modeServer Browser - Servers are sorted into 3 categories: Normal, Modified, Hardcore depending on their settingsServer Browser – Added support for retrieving update progressServer Browser - Now refreshes informationServer Browser - Join queue system when attempting to join a full serverServer Browser - All settings are automatically saved between sessionsServer Browser - Pings are sent via an alternate mechanism, which should work for non-Administrator users as wellClient - Fixed DX9 issue, which likely caused graphics glitches and perhaps crashesClient - Fixed some crashesClient - Toggle/hold crouch is user controllableClient - Toggle/hold zoom is user controllableClient - Vsync bugfixed for DX10/DX11Client - Rewritten how settings are written to disk; this should reduce/eliminate the spawn lagClient - Fixed bug where a player could join a server before the stats has been downloaded causing faulty stats in "EOR- unlock progression"-screenClient - New chat system allows chatting when dead (but not during end of round) and keeps a 100 lines logClient - Improved Play Now functionalityClient - Removed K/D ratio and Skill Level filters in the leaderboardsClient - Any points you get while being dead will be added to your scoreClient - Reduced negative mouse accelerationClient - Increased health on the Cobra to match other vehiclesClient - More informative disconnection/kick reasonsClient - Support for Map Packs so PC gets future VIP maps at the same time as consoles The Balance tweaks are as followed:Slightly increased the damage of the UZI at long range.The AKs74u now has more felt recoil when aiming.The G3, VSS, and all SemiAutomatic rifles now settle slightly faster between shots when aiming.The PKM, Type 88LMG, G3, An94, and 40mm shotgun have returned to their former glory.Increased the damage of the MG3 to bring it in line with the rest of the LMGs.Fixed a bug where the Saiga12 with slugs would do too much damage at long range.Fixed a bug where the SVU would do too little damage at long range.Fixed a bug where M95 rounds would not kill armored targets with headshots.
One little quick FYI: after patch has been installed it resets all of the controls to default and changes the mouse sensitivity to 0. So before you jump into a game go into options and tweak the controls to your liking.
PKM huh? 
