User blog comment:Damac1214/New Modern Warfare 3 gamemode "Roll Call" revealed + September DLC leaked/@comment-71.8.5.45-20120729225351/@comment-1055346-20120729225959

Since it's 3 Multiplayer Maps, we believe it is September. September is scheduled for three Multiplayer maps on the content calendar, where as August is scheduled for 1 Map, 1 Spec Ops Mission, and 1 Classified DLC