Everyone is speculating on what a new race or class might be and I honestly can’t think of much that would be relevant except maybe a mail caster shadow hunter type thing.
Honestly though I’d be happy if they put all that effort into more customization options instead. Subraces instead of a new race. Mag’har orcs, leper gnomes, dark iron dwarves, half-elf humans, Amani trolls, wretched blood elves, elven Forsaken, broken Draenei, more worgen variety (arctic wolves?), goblins– um. Fatter goblins. Sure. A less muscular and bluer-skinned highborne model. Taunka.
Like instead of pulling some mildly relevant nonsense out I would totally take more customization.