I don’t think Grace Anasi is a Sage. At least I hope not; I hope she is a playable Sim. The green-haired witch looks like she could be though. I love the way she holds her hands together in the trailer. She looks powerful and potentially dark, so I am thinking she might be the Sage of Untamed or Mischief magic. There was a picture of released of three sims, one of whom had white or blond hair and was wearing a yellow dress. She looks like she could be a Sage (maybe of Practical magic). That could just be me (she makes me think of Helga Hufflepuff).
What I am hoping for is a variety of spells that we haven’t seen before from all the branches: transformation or transfiguration spells, conjuring, summoning and banishing spells, telekinesis spells and spells with permanent effects. Of course I hope there are a few weather spells (with cool animations) and fix-it spells, but I would rather not have the little cheaty spells that give minor buffs or are temporary. One of the problems with TS3 was that a lot of the spells were very short-lived. Magic should have a real weight to it in terms of cost and consequence.