Although it's not a big surprise, a recent IGN Review has revealed that Call of Duty: Modern Warfare 2 DLC is already planned by Infinity Ward.
Downloadable content is set to include online map packs alongside missions for the successful Spec Ops.
Additionally, Infinity Ward recently released a small (non-downloadable) update for the console versions containing new gamemodes dubbed 3rd Person Team Tactical, Team Deathmatch Express, and Mosh Pit.
Here are their descriptions, to quote:
"3rd Person Team Tactical
4 vs 4 in the 3rd person perspective with mixed game types such as Domination, TDM, etc.
Team Deathmatch Express
Regular Team Deathmatch with shorter intermissions in between matches
A random selection of any game mode. You never know what you're going to play."
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