"Banzai, Corrosion and Sub Pens" Are the new areas to look forward to in the new map pack 2 and Treyarch is giving us some weather affects too. From what he buzz is giving out, mist and fog are just two that should prove to really add that 4th dimension to these maps and tide us over until MW2O.

"Shi No Numa" (Zombie Swamp), Imperial Zombies rise from misty swamps in an all new co-op experience, with a level that features a mix of traps, flaming Hell Hounds, Perk machines and the deadly, new Wunderwaffe DG-2, as well as 10 new Xbox 360 Achievements/PS3 Trophies that can be earned along the way."

 Costs are always speculative, but I think that we'll see it in the same price point for xbox and free again for the pc.