People have been asking for this for a very long time. The whole Wolf Mark System is due for an overhaul. More mounts, minions, barding for your chocobo, housing items, new gear sets (especially one that is equip-able between ranks 35-50 which has been conspicuously missing), and vanity items... the list goes on.

Personally, Barding and gear are at the top of my list, followed by new minions, but we've been waiting for a long time. Only items we've seen added are the Tp regen ones so far.