Ahead of a rumored announcement next week, Activision has revealed an official teaser video for the new "Call of Duty" video game. There's no title, no gameplay, only a cryptic warning delivered by an unknown soldier of the "Settlement Defense Front" along with blurry footage. Infinity Ward, the developers of the original and 'Modern Warfare' series, are returning for their first entry since "Call of Duty: Ghosts".