With DK and Warlocks I don’t think they can make a necromancer without gutting what’s left of Demonology or a DK Main Unholy theme…IMO
However with Evokers introduce Race and Class in one… I can see Lich Heroic Class possible if they take the best range spells powers, passive, trinkets abilities and talents from the Covenants.
I definitely would take a few from Maldraxxus and its slime focus one! I really like their take on Necromancy… specially how they use Slime! lol
Then again, the Evoker third spec if not Tank inspired by Black, Nether and Twilight Dragon flights like the rumors would suggest, it could be a Draco Lich DPS Spec who can draw powers from whatever is opposite or its antithesis of their Aspectral powers.
However if they introduce for existing classes Heroic Specs I can see this as instead of taking if be give existing Classes different way to play a similar spec:
Example of Heroic Spec:
Warlocks can go full Necromances built on their similar ability to use Affliction and Demonology
DK. DH and Paladins can go Void Knights taking some of their theme but making them full Void oriented with similar spells but Shadow Base… with its own small twist on mechanics.
You wont be taking from classes but enhancing them, built up with already similar mechanic…
Anyway that easier said than done… I know, but that’s how I see it happening. (IMO)