My idea is that Assembly Hall will have only three standard units from Ered Mithrin(with movie design of Iron Hills army):
1) Guardians of the Ered Mithrin(with sword and shield)
2) Phalanx of the Ered Mithrin
3) Ered Mithrin crossbowmen
So, Orocarni unit will be gone.
Yes, you're probably right, Ram riders only as Dain's ability on level 10.