I suppose undead spawns and upgrades are finished, otherwise Yak hadnt put them into T6. Creeps are finished for long. Necroes dont spawn for creeps (although tricksters can revive), and adding another up to tricksters would require new ups for priests and UD casters as well, so no good idea to me.
Yeah, read it somewhere else, wanted to edit and forgot. Sorry for talking about things I don't have a clue of. Still, I bet Yak got enough ideas for UD talents ~~ No offence towards killinday though.