Really, Feather Fall is a must. Pretty much one of the Core Spells for a DnD game right along with Magic Missile.
Also, do we know if there are specializations with specific Spell Types? If so, Illusion Spells could be REALLY cool. If you could make a spell that really works well with an Illusuion-basis, that would be a win for me!
Plus, even crazier idea: What if you could have some sort of Illusion Spell that actually makes an opposing player's surroundings look different during a PvP setting. Imagine, another PC thinking there is a wall that doesn't really exist!