I think I may actually read the new book about
the rise/fall of Arthas. Read the article if you're not afraid of a few Wrath of the Lich King spoilers. Seems like Sylvanas gets plenty of attention. It looks like I roleplayed her as a bit less insane and ambitious than she actually is: the review pretty much confirms that she has no problem with wiping out the Living if she perceives them as a threat -- and being thorough about it.
shin_michael, Leon's hallucination may have been entirely within the realm of possibility...