Activision has shot out a launch trailer for the Call of Duty: World at War Map Pack 3 to convince the unconvinced ones to pick it up today, highlighting the three new multiplayer (Battery, Revolution, Breach) and one new zombie map (Der Riese). As usual, the pack will cost 800 Microsoft Points on Xbox Live and $10 on PlayStation Network, and we’re fully expecting it to turn the 4 million number into at least 5 million in no time.