I'm surprised no one is proposing a Druid Mage who is trained in all 4 elements (earth, fire, water, air), and NOT trained at all in Nature.
For me, this will DEFINITELY be an 'Elementalist'.
My only problem with Nature + Earth magic being trained is purely from a card distribution point of view, rather than a thematic one - Water magic would remain the ONLY spell school to not have been fleshed out (unless the Necromancer would weirdly have Water trained)
I saw an old list of future mages that included "illusionist", "paladin", and "sorcerer". I wonder if the sorcerer is an elementalist-type.
I strongly suspect that the Necromancer will have a theme that includes ice magic, and he will be trained in Dark and Water. Maybe we'll finally get to use that "defrost" ability on all the fire spells! This isn't to say that the druid isn't
also trained in Water.
But the more I think about it, I could easily see the Druid getting trained only in Nature, but with a plant focus replacing the animal focus of the Beastmaster.