As long as we are speculating on the new classes, I’d like to toss in a “W”:
the
Witch-Doctor.
A long time ago (1e
MM), nonhuman races had tribal subleader types who were either
shamans or
witch-doctors. The former had cleric spells and the latter had a mix of wizard and cleric spells.
The witch-doctor combined Divine and Arcane powers and could well be configured as a Primal Controller.
Primitive cultures currently have no arcane spellcaster archetype (I suppose you might patch in a Warlock, but this still leaves tribal cultures without a controller type. Druids aren't thematic for a lot of tribal cultures).
Since the old witch-doctor was very close to the shaman, it is a fertile field for keeping the name and concept, while doing an orginal take for the new edition.
If you were going to empower a completely Primal setting, then you’d have to fill this niche with something.
A Witch is a long shot,
IMO. I haven’t seen
WotC do too many gender-specific classes in core books.
Shamans: Definitely a returning concept. It’s appeared in Dragon magazine several times over the years and there was even a 2e “Shaman” book.