Which is why they can’t really be new classes. Only tinker sounds like it could be a separate class. Others might be new specialization material, maybe.
I think that classes can be split off and the old ones could lose some abilities to make way for the new classes, which is what happened previously with DH and metamorphosis. I can see how some of them could work as specs though.
Dark ranger (Hunter, Forsaken-only)
Berserker (Warrior, Troll-only)
Witch Doctor (Shaman, Troll-only)
Warden (Rogue)
Spellbreaker (Warrior, Blood Elf-only)
I’ll give you an example I know pretty well : feral.
Their AoE and particularly burst AoE is inexistent.
Their Burst Single target is tied to convoke the spirits, and it can only be used when there is only a single mob, otherwise you might loose the burst single target to random (useless) spells thrown at other mobs.
They have less utility than other specs in the same class (no innervate, for example).
Without convoke the spirits, they’re trash.
etc.
Things like that can be said for pretty much all the classes, because they are inherently incomplete and need the additional “systems” (like covenant stuff, legendaries, etc) to feel playable.
Dark Ranger - mail or leather armor.
Tank, melee and ranged dps.
Basically, take elements from the reworked specs.
Rework blood DK.
Ditch the ghostly, purple theme that subtlety rogue has at the moment.
Rework survival and marksman hunter.