July 30: Activision and Infinity Ward today unveiled a special pre-order bonus for Call of Duty: Modern Warfare 4, which provides early access to the single-player campaign. War erupts on the Korean Peninsula as North Korea launches a full-scale invasion that threatens to destabilize the world in Call of Duty: Modern Warfare 4. Also shared today is a first look at Losing Ground, one of the big war missions from the campaign, following the Korean grunt squad through the chaos on the ground.