Zaran
Adventurer
And that intelligent undead are not universally, inherently and irrevocably evil.
Which implies that there are certain circumstances under which the creation or the act of becoming undead is not evil either.
Thus leaving a gap for a Necromancer in 4Ed's "no yucky evil PCs" design theme.
I can tell you that the ghosts in that picture did not want to be undead. And they weren't created by a necromancer. Necromancy is about using death magic or the twisting of the life force to the will of the magic user. There is nothing heroic about that sort of thing. A necromancer might believe he's doing good but so did Anakin Skywalker.
And for you guys who want to play necromancers. Go ahead. I'm not saying you can't. I'm not even saying that DnD doesn't have a place for it. The necromancy school of magic has been a part of DnD for a long time.
I'm just saying that I do not like them and will not buy a book because just because it has necromancers in it.