I'm honestly hoping that Obsidian finds a way to get around the problem of caster supremacy. I'm tired of having a fighter who has normal attacks and sometimes he can hit a button to do a bit more damage.
As opposed to a mage who can light someone on fire, freeze them, shock them, summon monsters, blind them, put them to sleep, poison them, make them fight their friends, unlock locks, read minds, become immune to types of damage, etc.
Not to mention generally mages skills are tied to intelligence or some equivalent in the stat system which tends to give them more leeway in dealing with social situations (Think Torment).
Honestly I'd like everyone in the party to have some sort of class based magic. Let everyone be interesting. Just think about KOTOR 2 where you could have an entire party of Jedi. They were all force users, but some were fighters while others buffed and threw lightning about.