On February 14th 2011, Infinity Ward announced on their forums that a security update for all platforms (Xbox 360, PS3, PC) would be released shortly. On Feb. 23rd it was stated that the patch had entered "certification at Sony".
The patch will address "security issues that have affected online play", as well as a glitch on the map Fuel, where players could glitch into a rock and become invisible to enemies.
No other details have yet been released, and a release date has not been published.
This is, however, great news for the CoD community.
Main article here: http://www.infinityward.com/forum/viewtopic.php?f=32&t=373630