Originally Posted by NarcissistZero
There are patch notes.
Mostly multiplayer hack stuff.
Call of Duty: Modern Warfare 2 Update Released
January 13, 2010, 4:36 pm - Valve - Product Update
Updates to Call of Duty: Modern Warfare 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:
Call of Duty: Modern Warfare 2
* Fix for latest texture hacks
* Fix to prevent players from getting inside geo
* Fix to prevent players with illegally pirated copies of Modern Warfare 2 from matchmaking with legitimate Modern Warfare 2 players
* Connection improvements for NAT-PMP routers
* Fix for "elevator" glitch that allows players to get out of playable area
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