One issue i always had with TES3 and 4 was the lack of gear for magic casters. Sure we had rings and robes, but everyone could use rings and robes. They added staffs in 4, but it wasn't gear so much as a rocket launcher in stick form. What I would like to see (though obviously they're pretty far into development, no need to remind.) would be staffs that act less like batteries for spells, and more like amplifiers, and modifiers. Such as a staff could increase all fire attacks by 20%, or all alteration spells require half casting time/magicka.
these are just pretty basic examples, with plenty of room for staffs that do just give spells, or more complex effects, but i think it would flesh out magic casting more. Input?