Rejoice Comrades! A vet from World at War Returns!
If anyone enjoyed World at War cause of Sgt. Reznov? WELL GUESS WHAT!!! HE'S BBBBBBAAAAAAAACCCCCCCCKKKKKKKKKK!!!!!!!!!!!!!!!!!
AG: So there's a very rich and deep history to the Call of Duty lineage. Is there a chance that we might see characters or events from any of the most recent games crop up in Black Ops? A lot of the characters from Modern Warfare 1 and 2 are old-school guys who could have been around or involved in events you're touching on here.
Josh: Well I can tell you - and again, not to spoil the game - there is one character from World at War who is going to make a return, and that's Reznov. But I don't want to tell you what capacity he works in our game, but he has a pretty big part and the players who experienced World at War are going to recognise him. But that's all I can really disclose right now and believe me, I would love to tell you about the whole game but I just don't want to spoil that experience because this story is just so rich and deep.
Source: Call of Duty: Black Ops Interview - AusGamers.com