Feral Interactive today announced that XCOM: Enemy Within, the expansion pack for the strategy game XCOM: Enemy Unknown, will be released for OS X on November 12 in North America and November 15 internationally. Developed by Firaxis Games and published by 2K for PC and consoles, XCOM: Enemy Within adds a massive amount of new content to previously purchased copies of XCOM: Enemy Unknown and XCOM: Enemy Unknown – Elite Edition….