User blog comment:Bovell/"Call of Duty: Project Colossus" = Modern Warfare 3? + Micro-transaction Call of Duty for China in the works/@comment-173.65.132.194-20110511132434

Beyond plans for the next retail release, Activision's also working on a free-to-play online version of the game that will be available exclusively in China, where the microtransaction model is immensely profitable. There are no plans to bring the product to other territories, but CEO Bobby Kotick noted in the call: "That's not to say it might not have applicability elsewhere."

http://blog.games.yahoo.com/blog/668-activision-call-of-duty-black-ops-used-more-than-facebook