One big game play change being introduced in TI is the appearance of hostages. Expect active civilians within the map that run around, react to events happening around them (bullets flying by), getting in the way, and being used by terrorists as human shields. Another element is introducing dogs -- not little Chihuahuas that the civilians carry but big dogs, German Shepherds or Rottweilers that players can command. The demonstration I saw had Minh order a dog to attack a terrorist. The dog quickly ran to the terrorist, jumped up, and attached itself to his arm. A split second later, Minh dropped the terrorist with a few quick shots.