Sorry if doubling anything already said but:

Ability to hear more of a voice. (Battle sounds.)
More face options.
Separation of horn and scale patterns for Au Ra faces.
All hairstyles for all races. (Except perhaps the ones on Roes with the special hair lines.)
Ability to choose tail tip colour on Miqo'te.
Ability to choose horn tip colours for Au Ra.
Colour wheels for hair/eyes/tattoo/face paint/make up.