There are also bug fixes and Second Wave additions
The development team at Firaxis is updating XCOM: Enemy Unknown with Patch 3, designed to introduce all the new Second Wave options for free while also eliminating a number of problems and unlocking a new hero for the player to use.The Artificial Intelligence bug has been fixed, which means that aliens will no longer teleport in the middle of a player squad to face instant death, while the problem with a Defeat screen shown after beating the game has been minimized.
A new XCOM hero called Chris Kluwe has also been added to the game, although Firaxis has not offered any clear details on his abilities.
A full rundown of the options introduced via the Second Wave free DLC is available on Softpedia.
XCOM: Enemy Unknown is one of our Games of the Year for 2012.