Modern Warfare 3 is now available for pre-order on steam for £39.99. The page on steam includes a variety of screenshots and a video containing the locations of the single player campaign and online multiplayer maps. On the ‘about the game’ section is says: On November 8th, the best-selling first-person action series of all-time returns with the epic sequel to the multiple Game of the Year award winner Call of Duty®: Modern Warfare® 2. There are no system…