User blog comment:Damac1214/Modern Warfare 4 supposedly leaked, Captain Price to return (UPDATE - Confirmed False)/@comment-1055346-20121030160836/@comment-3967954-20121030161604

Black Ops wasn't a direct sequel to World at War, it was just set in the same in-game universe. Kinda like how Saint's Row is set in the same universe as Red Faction.