I think more personalization, I want my character to be more custom for me.
I have 14 lvl 90's and have most professions covered and since they are nerfing the bonuses for them, Nothing should change more than that, other wise I won't make gold :P
But I think more epic looking weapons/gear/mounts and pets for pet collectors, I know people will complain if they re released ways to get epic things like the ashbringer, I would love to be able to obtain them (I played in BC and missed that chance to go back and clear Naxx to get it for my pally), plus more ways for me to have cash sinks, I enjoy having a goal of buying.