Now I will make note of this for those of you who are interested in DLC for achievements only - only the second and third map packs have achievements tied to them. So if you only care about DLC for that reason only - save yourself the 400 MS points and buy just the second and third map packs for 1600 points (800 each).
Fight through war-torn Berlin in "Nightfire," battle through the jungle and waterfalls of "Banzai," and defend an armored island in "Battery." Zombies and Hell Hounds attack in "Verruckt" (Zombie Asylum), "Shi No Numa" (Zombie Swamp), and "Der Riese" (Zombie Factory). Survive against the onslaught of Zombies with the help of Perks-a-Cola machines, Monkey Bombs, and the powerful Wunderwaffe DG-2.
Basically each map pack includes one regular multiplayer map and one zombie map. Anyone else smell overpriced DLC? I certainly do....