For the Aria of the Valar level boost that's included in the Mordor pre-order:

Will it be available to purchase in the game store as well, or will this only be a one-time thing with the expansion purchase?
If available in the store, when will that be? Will it be delayed until after Update 22 like High Elf store purchases?
What is included in Aria of the Valar? How does it compare to the existing packages?