As Treyarch announced last week, Map Pack 2 for the PC version of Call of Duty: World at War has been released for free.
Patch v1.5 installs a new Nazi Zombie map, three new multiplayer maps, and fixes several bugs and gameplay problems, as described in the patch notes here.
The new multiplayer maps Banzai, Corrosion, and Sub Pens have been added.
More information can be gleaned from CallofDuty.com!