It would probably download an update when we went to go online, or if it cost money they're will probably be something at the bottom telling you how to get it
As far as the News feeds I've looked and read through, Black Ops versions XBOX 360, PS3, and PC will be the only systems getting Map Packs. Nintendo Wii was not added at all, and that seems specific because each three websites just stated those systems alone. I'm sorry guys, but Wii don't get Map Packs.