According to this news by World of Raids, Necromancer could very well be a class in the future for World of Warcraft, as it's already been considered by the development team when tossing around class ideas.
We've already seen a few Necromancer NPCs in the game, with the most notable being Kel'Thuzad. His lackies from Naxxramas, Gothik the Harvester, Heigan the Unclean and Noth the Plaguebringer were also Necromancers.
There are others of course, which you can find here, but this brings an interesting question. What spells would a Necromancer possess in their arsenal; could this be the Dark Knight's "Priestly" brother class -- one of the next Hero classes? WoWWiki notes that the class was definitely planned for the original World of Warcraft game, but it didn't make it into release -- as was the Death Knight.
The three spells from Warcraft III's unit would be a nice addition to the game's class balance dynamics -- with some of them obviously needing to be toned down, but what other abilities could you conjure up in your mind for a Necromancer class, if it were added?
Feel free to share your ideas in the comments below!