I made a post about character customization a while back, I went over each race and gender and what they had compared to each other in each face category.
You will notice female Au Ra is lacking greatly in almost everything.
(for the males, Roegadyn is the most lacking) Compared them to Miqo'te you will see what I mean.
http://forum.square-enix.com/ffxiv/t...-Customization
Female Au Ra VS Female Miqote
Jaw Selection:
Au Ra 3
Miqo'te 4
EyeShape Selections:
Au Ra 5
Miqo'te 6
Eyebrow Selections:
Au Ra 4
Miqo'te 5
Nose Selections:
Au Ra 5
Miqo'te 6
Tail Shape Selections:
Au Ra 4
Miqo'te 8
I think there is a limitation to how much they can add as far as individual parts (most things are linked to each other, such as ear Shape and Tail shape. Or Muscle Slider and Ear Size/Tail Size) This was probably why Au Ra Horns ended up linked to their faces, they just couldn't add anymore selections.
Personally, I'm not sure if PS3 Limitations or lack of resources are really the problem for adding things within those selections. Every Patch you see them adding more and more Hairstyle selections to the character creator but nothing else for races that need them. When you look at hairstyle selections there doesn't really seem to be a limit, this probably means they can add a lot more face types/ear shapes/tail shapes etc etc for all races.
Will we ever see them added? Probably not unless a lot of players want it. People normally want big things. For example if the devs were trying to figure out what to add for a future patch Hairstyles vs some new Noses/Jaws, Hairstyles would be the more popular Choice.