The following updates have been issued to the Xbox 360, PS3 and the PC version of MW2. The PC version updates have already been released. There is no time frame as to when the Xbox 360 or PS3 will get them, expect the PS3 to get them sooner than the 360 though.
- Care Package, Emergency Airdrop, and Sentry Gun marker grenades sprint speed normalized.
- Sentry Guns: Improved placement detection, preventing cases of Sentry Guns inside geometry.
- Model 1887: Bling using Akimbo and FMJ combination now has same range and damage as non-Bling Model 1887s.
- Improved player collision removing cases of getting into geometry and ‘elevators’.
- Fix to prevent various XP hacks, including the prevention of obtaining negative XP.
- Mouse latency tweaks for more mouse movement consistency. (PC-ONLY)
- Fixes to prevent various texture hacks (PC-ONLY)
Source: fourzerotwo.com