First, thank you for the recent changes to the wizard. I've yet to optimize my build but so far I've been enjoying playing Thaumaturge for the first time since Mod 16. The changes were enough to bring me back to the game after a break over the summer. Keep it up!
I know this is probably not something you can do easily without the art department, but I would love to see more effective AOE at-will powers. Scorching burst and Storm Pillar are both incredibly slow to fully charge and cast compared to the fast sword/knife flipping of melee classes. I don't know d&d lore, but there must be something in the books for wizards that can hit multiple targets quickly and repeatedly. Preferably, without any charging mechanic.