XCOM: Enemy Within Security Breach Trailer and Screens

A rogue organization, known as EXALT, is threatening to undermine XCOM operations by acquiring alien technology for their own use
2K has released a new video and twelve screenshots for XCOM: Enemy Within, an expansion to XCOM: Enemy Unknown due to be available in North America on November 12, 2013 and internationally on November 15, 2013, for Windows PC, Xbox 360, PS3 and Mac (the latter being distributed by Feral Interactive). XCOM: Enemy Within adds an array of new abilities, upgrades, and weapons to combat new enemy threats. The expansion also provides players with all-new maps, tactical and strategic gameplay, and multiplayer content.
Fans will experience an additional three to four playthroughs on average before encountering all of the new material included in XCOM: Enemy Within, providing nearly limitless replayability.