Gamers who sign up for the Call Of Duty Elite premium subscription package will pay £34.99 or $49.99 a year.
Those who buy the Modern Warfare 3: Hardened Edition, priced at $100 in the US, will get the service for free.
Call of Duty: Elite gives subscribers free access to downloadable content including maps, game modes and Spec Ops missions, tournaments, video content and game play statistics.
In June, two milliongamers signed up for the Elite beta in just two weeks.
The game launches on November 2011.