I like the avatar expressions and customization. A lot. It makes it easy to create limitless unique characters.
More models, actions and facial expressions would be nice. Like birds, bears, rodents, horses, snakes, dragons, etc. And the ability to growl, purr, hiss, bark, yelp, and so on.
Also, more official maps are always cool. It'd cause less lag and arguments over territory and more room for members so the game won't be too overcrowded in certain areas.