Since it has been officially announced now, i should really go into a little more detail about it.
On the 1st of February 2011 Xbox 360 gamers will get the first taste of the new maps.
The actual DLC includes 4 new maps and one new zombie map
and of course the zombie map will be called Ascension
The map which stands out the most to me seems to be 'stadium', not much is known, however it appears to be in a hockey rink style stadium. Now i already have a picture in my head of what this will look like and i can imagine it being one of the smallest maps, perhaps even rivalling nuketown :O
Some sad news for you PS3 and PC gamers though, you won't be getting your hands on these new maps until about a month later.
oOo SnorLaX oOo