A list of patch notes for the Xbox 360, PS3 and PC versions of Call of Duty: Black Ops 2 has been released.

The title updates were designed to address a number of launch issues on all three platforms, with the Xbox 360 patch having released yesterday, the PS3 one on November 17, and two separate PC ones on November 16 and 21.
Full details of each follow, courtesy of MP1st:

Xbox 360 Title Update 1 Patch Notes

Made infrastructure and performance improvements to Live Streaming.
Made streaming performance improvements to video playback in CODTV.
Addressed an issue where flight range parameters for airborne vehicles could be deleted in the middle of a match due to a network interruption. This fix resolves the following symptoms reported by the community:
Escort drone flying under the map
Inability to call in the Dragonfire
FHJ-18 weapon level is now increased by destroying Scorestreak vehicles and aircraft.
Care Package/AGR canister exploit has been addressed.
Patched a small map exploit in Aftermath.
Addressed a rare situation that would cause the Emblem Editor menu to overlap other menus.
Balance pass on spawn influencers to improve cases causing non-optimal spawning under certain conditions.
Improved performance for emblem uploads to prevent an occasional hang. If there is an error connecting to servers during an upload, you will now be able to re-try your save.
Emblems and Clan tags will now appear correctly on the Assault Shield when stowed on the back.
Addressed all reported UI error code messages.
Elite Clan Friends list no longer actively sorts players when their status is updated. The player list will refresh after closing and re-opening the tab.
Improved a number of emblem icons in the Emblem Editor.
Junkyard IV reward added to Calling Cards.
PS3 Title Update 1 Patch Notes
Made performance improvements to matchmaking and lobby timers to start matches faster.
Addressed an issue contributing to the majority of reported freezes. A small number of low frequency cases continue to undergo investigation for the next patch update.
Many backend updates have been made since launch to streamline servers for load balancing. This results in many general improvements to matchmaking, user content servers, leaderboards and online security.
Made infrastructure and performance improvements to Live Streaming.
Made streaming performance improvements to video playback in CODTV.
Addressed an issue where flight range parameters for airborne vehicles could be deleted in the middle of a match due to a network interruption. This fix resolves the following symptoms reported by the community:
Escort drone flying under the map
Inability to call in the Dragonfire
FHJ-18 weapon level is now increased by destroying Scorestreak vehicles and aircraft.
Care Package/AGR canister exploit has been addressed.
Patched a small map exploit in Aftermath.
Addressed a rare situation that would cause the Emblem Editor menu to overlap other menus.
Balance pass on spawn influencers to improve cases causing non-optimal spawning under certain conditions.
Improved performance for emblem uploads to prevent an occasional hang. If there is an error connecting to servers during an upload, you will now be able to re-try your save.
Emblems and Clan tags will now appear correctly on the Assault Shield when stowed on the back.
Addressed all reported UI error code messages.
Elite Clan Friends list no longer actively sorts players when their status is updated. The player list will refresh after closing and re-opening the tab.
Improved a number of emblem icons in the Emblem Editor.
Junkyard IV reward added to Calling Cards.
Black Ops PC updates
Max FOV increased to 90
Fix: Horse falling through the world in Afghanistan when playing on some CPUs with 4 or more cores
Fix: RC-XD and the AGR sinking into the map in MP when playing on some CPUs with 4 or more cores
General performance improvements in SP, MP, and ZM for CPUs with 4 or more cores
Fix: crash when a 7th player tries to join a 6 player league lobby
Improved dedicated server matchmaking
Fix: some cases of "Connection Interrupted" in MP while loading into a match
Server connectivity improvements
Fix for transmission errors during League Play
Fix: crashing when running with no Audio device
Fix: error when going into the sound options menu with no sound device
Make sure laptops with both integrated and Nvidia GPUs always switch to the Nvidia GPU. This will fix bad performance, ability to join matches, and possible crashes
Multi GPU performance improvements
Livestreaming improvements
Fixed freeze if the player tries to change graphics options after rendering a movie or live streaming
Speed up going into Options menu in some cases
Fix: Various additional errors, crashes, and other compatibility issues