Following this week's rumours, a senior UK trade source today told us that the Treyarch-developed title is scheduled to arrive a full 12 months after last year's Modern Warfare 2. They added that the game would be set during the Vietnam conflict - and takes particular influence from classic movies Apocalypse Now and Platoon. "Development is on course - and Treyarch have been told the game must be ready to hit shelves before the gifting season."