I'd like more utility spells also...vanilla damage types are fine and needed, but they don't intrigue me as a player.
I think the future of this has to be having additional casting classes which specialize. The rune mage seems to be a very powerful class, restricted only (and its a big restriction) on the player ability to trace the runes well.
Perhaps adding wand or staff types that needed to be equipped to cast certain spells which couldn't cast others as well or at all. For example, a mentalist wand that allowed charming, mezzing, polymorphing, rooting...but didn't allow the casting of direct damage spells or severely limited the damage on them.
I'd also like to see a healing cast class at some point. The healer cleric is just so ingrained in RPGs that it seems like a missing spot in Orbus to me.