Many of us are in the same place, there are very few back shells on the market right now at all, none of them faux or real leather.
You have two choices:
1. Grab one of these to last a month or two until the market catches up and releases some nice Air 2 back shells w/Smart Cover compatibility:
http://www.amazon.com/KAYSCASE-Prem...id=1415200023&sr=8-8&keywords=ipad+air+2+case
2. Be careful with your Air 2 and wait it out.
All of us are scraping eBay and Amazon every day looking for back shells. Myself, I want a black rubber painted one which I had from Marware and used for years on my iPad Retina. I have the Kayscase one mentioned above and it's good for its short-term purpose. I'm also resorting to getting a Khomo case which has the black rubber back (yes!) but has an attached cover (no!) and attempting to slice the cover off and I should have that tomorrow, stay tuned for photos of that experiment.
BJ