User blog comment:Callofduty4/Robert Bowling wants free classic maps for MW3/@comment-165.125.144.132-20120228183534

A cool idea would be if they did something similar to RockBand. DLC from the previous games are usable in all the newer games, and you can pay ~$5 for an unlock code to download the songs (would be maps) from the older games. I'm sure this is easier said than done with the technical aspects, but it would be pretty cool.