official Xbox forums, Infinity Ward community manager Robert "fourzerotwo" Bowling rather strongly suggested that the development team has moved on from COD4 and is gearing up for its next project, whatever that may be.
Bowling also discussed the issue of balance, perception and DLC. In his words, "If you include [the maps] out of box (shipped with game for no extra cost) then it's just ignored and people demand more. If you instead, decide to get the game out and then worry about beefing up the map selection via DLC, people say ... 'this should have been included in the shipped game.'"
We hear ya buddy, now how about six more COD4 map packs?
[Via Gamer Limit]