To start, a new skill, Animal Trainer. Not as combats pets, but rather as vanity, or, as it suggested elsewhere,a pet that could be used to find track artifacts, as guard/warning, or as pack animals, and of course as mounts. These could be sold in either the AH or thru the mount dealers.(although the idea of having a harpy as a combat pet is interesting)
Whips as a weapon.
Expanding the customizing of characters like hair, facial hair, height, general build from any of the races. Lets face it the Guardian human beards are lacking.
Y'all feel free to add to this.