What do you mean "now that Hollowfaust is out"? It came out a long time ago. It was the second city/regional sourcebook for the scarred lands around the same time as mithril. Has there been a second edition already?
Let's see there is Hollowfaust, Gar'Udock, Green Ronin's Necromancer Handbook, and Mongoose's Acane Encyclopedia Necromancy, as well as a ton of necromancy spells and prestige classes in general magic sourcebooks like relics and rituals and tome and blood. So there is a bunch of support material for the bad guy specialty.
I still haven't specialized, although my good wizard who travels with a paladin does have a number of necromancy spells and doesn't want to stop learning spells from the school.