This'll be the second time I've referenced Dark Messiah in a topic, but that game did a lot of things right.
So, I'm hoping Bethesda gave mages nice animations for preparing and casting spells. For an example from Dark Messiah, take the lightning bolt spell from the multiplayer. When you're passive with it selected, there's distortion around your hands, like from a gas stove, and you can see sparks. When you begin to cast it, you're hands spread apart as the bolt forms...just watch this video.
http://www.youtube.com/watch?v=_sx4UIGfZuk
It goes a long way in making you feel like a master of the elements.