Catch up with COD XP in video recap

A four-part Modern Warfare 3 Multiplayer Briefing contains Call of Duty's four pillars of design, multiplayer details, premium membership perks, and trailers.

Activision CEO Eric Hirshberg took to the stage at the start of Call of Duty's fan event, Call of Duty XP.

The series is based on four design principles, he said: epic realism that crosses authenticity with blockbuster moments; a desire to create the ultimate adrenaline rush; making games that are easy to play but hard to master; and screen refresh rates of 60 frames per second for a smooth, precise feeling.

The biggest draw was Modern Warfare 3's multiplayer, which aims to be "better, more strategic than ever" for the series veteran and "more fun for the newcomers". Robert Bowling and Mike Condrey from two of the game's developers explained how they've altered the multiplayer mode to reflect that.

The series' new player portal Call of Duty Elite was also given significant focus, with Hirshberg underlining the service's free features before promoting its all-inclusive premium membership.

Call of Duty: Modern Warfare 3 Multiplayer Briefing
Part 1 http://youtu.be/ueIVeo1Xm4M
Call of Duty Endowment
Brand partnerships - Xbox 360, Doritos, Mountain Dew, Jeep
Short film - Find Makarov: Operation Kingfish

Part 2 http://youtu.be/Ro0spdSNgNs
Call of Duty's design secrets
Progression in Spec Ops
Multiplayer Trailer - World Premiere

Part 3 http://youtu.be/QJxrNqJLWKY
Multiplayer details with Rob Bowling (Infinity Ward) and Mike Condrey (Sledgehammer Games)

Part 4 http://youtu.be/t16Lx08qT28
Call of Duty Elite Free & Premium
Jeeps in MW3 + Jeep Wrangler: MW3 edition