Well, as I am currently working on that ...
Arrancar Status:
*race done
*towns/areas created
*done with the training folks, next up is the Las Noches / Hueco Mundo Shop + more setup
*working on the Arrancar spec (Bala/Cero)
Note:
Healing will be done by 4th Division, I'll treat that as a armistice as the Arrancar normally have no healing division of any sort.
Later I might add Orihime, but it's just a real load of work.
To clarify, most of the core things I need to twist for Arrancar, many aspects are "game-in-a-game" thingy. -.- hence it's difficult and takes time.