The druid coming back is very likely, as there is no class with control over the winds, earth, life/living animals, or shapeshifting. The necromancer coming back is unlikely as it shares to many aspects with the witch doctor compared to the druid. Flavorwise my vote goes to the Druid as a returning class, at least in spirit.
Just a shapeshifter class I think could be a real possibility or maybe an actual demon/angel character class.
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Just a shapeshifter class I think could be a real possibility or maybe an actual demon/angel character class.