Yep, I got the same email.
This is a copy of what it said in the link it gave:
Nightfire
In "Nightfire," players take to the streets of a war-ravaged Berlin with only the flames of the burning city to expose the enemy.
Station
"Station" offers a bombed out underground train station littered with hidden passageways and destroyed subway cars.
Knee Deep
"Knee Deep" takes place on the island of Peleliu in a once tranquil village turned chaotic Japanese command center.
Verrückt (Zombie Asylum)
The fan favorite 4-player co-op Nazi Zombies Bonus Mode returns with "Verrückt," a terrifying Zombie asylum featuring more weapons, perks via the addition of Perks-a-Cola machines, electroshock defenses and the endless zombie horde.
The team has been very quiet regarding details of our DLC until now, and we're so excited to let this content loose. DLC Map Pack #1 is due out in March of '09 for the Xbox 360, Playstation 3, and PC platforms. More details are soon to come, so be sure to check out CallOfDuty.com for all the latest news and updates regarding CoD:WaW!
I guess thay are to busy making DLC to fix the leaderboards for the wii, lol.

I wish the wii had a hard drive so we could get some DLC.
Heck, I would be happy if we could just get a Capture the flag mode on just one map.
