iOS strategy-action game XCOM: Enemy Unknown has received an update today that brings various new features, including asynchronous multiplayer and multiplayer leaderboards with full Game Center support. The update also includes optimizations for iOS 7, as well as general bug fixes. 2K Games has also put the title on sale for 50% off, with pricing currently set at $9.99. The game, which was released for gaming consoles in October 2012, was originally announced for iOS devices this past March and released in June with touch-optimized c
