Treyarch has released patch version 1.5 for Call of Duty: World at War which includes map pack 2 for free.
Patch v1.5 includes three new multiplayer maps and one Nazi Zombie map for the co-operative minigame. In addition, the update includes several bugfixes and gameplay tweaks.
The new patch is accompanied by a corresponding updated Linux dedicated server and a version 1.3 of the mod tools package that includes the assets from the new maps.