Call of Duty: Modern Warfare 4 | Reveal Trailer - YouTube Watch On It's that time of year again. The sun is out, air conditioners are on, and the next Call of Duty is public knowledge. Activision announced that this year's game is, as we suspected, Modern Warfare 4. This is the first Infinity Ward-led Call of Duty in four years—a fact that matters to longtime fans who prefer the studio's approach to military shooters. In a room full of press at the Infinity Ward offices last week, studio heads Mark Grigsby and Jack O'Hara introduced Modern Warfare 4's primary settings: North and South Korea. The campaign follows a squad of South Korean marines (plus one embedded American) in a "zero to hero" story in the wake of a North Korean invasion of Seoul. Grigsby and O'Hara were influenced by their love of Korean rap (featured prominently in trailers), and more broadly the spread of Korean culture, citing the popularity of Korean cinema and music in the West.…