Cod website says:
Considering the phenomenal support that the community has thrown behind Map Pack 1 and the demands that they’ve made for additional content, we’ve decided a 2nd Map Pack is in order! Today, we’re happy to bring you the first details of our next DLC.
Call of Duty: World at War Map Pack 2 expands the addictive CoD multiplayer experience with three new multiplayer maps and one new co-op/Zombie map. Battle to control the river bridge in “Banzai” - a bright jungle map featuring a waterfall and hidden caves. In “Corrosion” face down your enemy in a shattered train yard, and in “Sub Pens” wipe the monsoon rain from your eyes as you struggle over a bombed-out submarine base. The Zombies make a return in “Shi No Numa” (Zombie Swamp) featuring Perk machines, the deadly new Wunderwaffe DG-2, new Achievements / Trophies… and flaming Hell Hounds!
Map Pack 2 is slated for release this June.
I'm not quite sure if this is pc aswell