I'm guessing this is a viral campaign for XCOM or Borderlands 2, but since its right before GamesCom, I don't want to rule out a new game.
Website: http://citizenskywatch.com/
Twitter: https://twitter.com/#!/CitizenSkywatch
YouTube: http://www.youtube.com/user/CitizenSkywatch
Source: http://fusible.com/2011/08/take-two-publishes-teaser-page-for-yet-to-be-revealed-citizen-skywatch/
Website: http://citizenskywatch.com/
Twitter: https://twitter.com/#!/CitizenSkywatch
YouTube: http://www.youtube.com/user/CitizenSkywatch
Source: http://fusible.com/2011/08/take-two-publishes-teaser-page-for-yet-to-be-revealed-citizen-skywatch/