But there seemed to be a shortage of mage gear in OB.
Yes, you could enchant clothing, but so can any other character.
I'd like;
Wands, They'd be the daggers of magical weapons. Faster than a staff, but weaker.
Orbs, Held in the off hand, they significantly increase a spell's/spell school's power.
More clothes/robes. The clothes in OB didn't really have the "adventuring wizard" look. And the robes were mostly just recolors of the mage robe.
Something like this would be great for clothing; http://images2.wikia.nocookie.net/__cb20051217042459/nwn2/images/9/93/PHB35_PG57_WEB.jpg
Spell tomes. They would add spells that you could only use with the tome equipped. Since you can have a spell in each hand, I'd think they'd offer a powerful spell, with less magicka required.
Whippin' out a spell book an melting faces sounds awesome.
I'd also just be happy with more variety in staves and robes.
TL;DR - More items for mages.
Its unlikely that they'll add much more than they did in OB, but a guy can dream.
Any suggestions, what do you want?