I would like to see more variation in the weapon and gear design in wow.
Not necessarily different stats or abilities, but different looks.
If you look through Dalaran f.ex. you often see people wearing the same weapon or gear.
Titansteel: Destroyer, Spellblade etc etc for one (a while back of course).
I think it'd add to the diversity in the life of the average wow player.
Just my two cents.