Call of Duty: World at War DLC will make a return in Call of Duty: Black Ops, according to a listing at Best Buy Canada's online store. The description for the Hardened edition of the game details the four maps included with both collector's editions, describing them as "Four Zombie Maps Pack made famous from COD: World at War."
This information is further evidenced by multiple accounts at Black Ops fansite CODBlackOpsNews.com, where GameStop employees at several stores revealed marketing materials for the game (people even snapped pics, as seen here). The maps are said to be remakes of the World at War zombie maps "updated for the Black Ops engine." While we're glad to see the mode making a return in Black Ops, we're really concerned with something else -- zombies that can travel through time. That sounds, like, double terrifying.