Activision sent us another trailer featuring co-op gameplay from the upcoming video game “Call of Duty 4: World at War” coming soon to the PlayStation 3, Xbox 360, PC, Nintendo Wii, Nintendo DS and Playstation 2. Synopsis: Call of Duty is back, redefining war like you’ve never experienced before. Building on the Call of Duty 4: Modern Warfare engine, Call of Duty: World at War immerses players into the most gritty and chaotic WWII combat ever experienced. Players band together to survive the most harrowing and climactic battles that led to the demise of the Axis powers on the European and Pacific fronts. The title offers an uncensored experience with…