Due to the size of Back to Karkand, the patch weighs in at approximately 2 gigabytes (even for those players who have no plans to purchase the DLC). DICE admits that "this is not ideal", and it aims to "make potential DLC content in the future as optional downloads".
Some of the key fixes are as follows: Bugfixes:
Fixed a problem where player who joined queuing on end of round got spawn screen stuck on screen, but unable to do anything with it until next round loaded.
Fixed a problem where TV guided missiles could be shot into its own helicopter and destroy it.
Added alternate HUD colors to help colorblinds.
Fixed a problem with smoke on land vehicles, Missiles should now miss more often.
Fixed a problem where the user was unable to revive two players that have the bodies one over the other.
Fixed a problem where you could get green flashes on screen.
Fixed several weapons so they are properly suppressed and hide the player on the minimap when fired.
Tweaked Tactical Light so it is not as blinding over longer ranges.
Tweaked the IRNV scope so it is limited to usage only at close range.
Reduced the damage done to Armored Vehicles and Infantry from AA guns.
Increased the damage RPGs and Tank shells do to AA vehicles.
Slightly Increased the power of Fighter Jet Cannons against all vehicle targets, especially Helicopters.(Ooops its green but anywho)And. After this text WAKE ISLAND 2014 SCREENSHOTS
Source - GameSpy