It can be any game, including ones that have already come out.
My choice would be COD 4. If that game didn't come out, COD wouldn't be all the rage and the console market would have way more creative games.
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To all who wish that CoD ended at some point or will end with or before the next release; What is it that you wish to accomplish by eliminating the game series that by far has the highest player count on XBL? I see all this CoD hate with no reasoning for it. If it were no more, the people who play it would not play anything. So what good would come from eliminating it? If you don't like it, don't play it. It isn't that hard. I admittedly play and enjoyed the games from MW up to MW3, but not so much the most recent one. I play it because that is where the bulk of my FL is. But until something better comes along, this is about all there is, for me.