The 1.4 patch has finally been released and with it bringing another new map MP_Stalingrad and also including the anti cheat software Punkbuster.

Notes taken from the official read me..

PUNKBUSTER

Call of DutyTM now includes PunkBusterTM Anti-Cheat software technology. PunkBusterTM Anti-Cheat software technology and services combat online cheating in Call of Duty Internet play.

The use of PunkBuster Anti-Cheat software is optional and is provided without direct cost to our users. For more information about PunkBusterTM or for PunkBusterTM support, please visit http://www.evenbalance.com/.

NEW FEATURES

• Added one new multiplayer map. This map supports all current game types:

mp_stalingrad

Stalingrad - In the winter of 1942, Soviet infantry from the 13th Guards Division struggle to hold a small apartment complex in the southern end of the shattered city. Riflemen on both sides can cover the open ground while flanking teams armed with automatic weapons attempt to penetrate the enemy line through a deadly close-quarters maze of urban interiors.

• New PunkBusterTM functionality included (as described above).
• Added a "punkBuster" filter under the "Filters" section of the "Join Server" screen.
• Added a "punkBuster" display column on the "Join Server" screen.

GAMETYPE FIXES

• Corrected an issue in "Search & Destroy" where leaning while planting the bomb would cause the player to lean further than intended.
• Corrected an issue where a player could spawn without a gun model if the round ended while on a ladder.

MULTIPLAYER BUG FIXES

• Fixed a possible exploit with certain spectator-specific commands.
• Fixed a bug with the servercache.dat that caused some players to have difficulty loading the in-game browser.
• Fixed an issue where the number of servers displayed in the in-game browser would occasionally fluctuate.
• Fixed an issue where the pure server check would no longer ignore extraneous pak files if a demo had recently been played.
• Fixed a rare occurrence of the auto balance system preventing a player from joining either team.

You can download it from our good friends over on the cod-nation site