Hopefully Mages won't be too weak, especially considering their abilities are limited per day. I also liked how they were almost your most pivotal party member in BGII (aside from Protection from Magic Weapons....urgh that was a horrible spell that made fighting Mages tedious waiting games).
The way I see it they should be the 'glass cannon' kinda class. Able to throw out instakill or high damage AoE's a limited number of times per day, but if they draw aggro they go down pretty easily if they don't have all their short duration wards up.
Anyway, there is plenty of time til release day and I still have faith ><