avatars will still be unlockables, aka do things to earn the avatars, the avatars need to be replaced as each avatar takes up alot of ram. so we can't improve them, and there all different shape and size which has there own complications.
in the future the plan is to have mine craft like cuboid's. as they are efficient.
also we can then make the armer actually appear on the avatars and not just as an invisible cloak.
hoping to have joins in the arms and knees so move well and to improve combat.
bone animation is coming but its a lot of work.
Craig is giving us a lot in the next update and future ones to distract us while he dose some serious work.
Thats the plan anyway to my knowledge. welcome to fill in the blanks.