I can't speak for everyone, but here in WA my dealer (TITAN) has informed me in December 2015 that the Roush kit, including exhaust, supercharger, bodykit will be an option. They will be shipping the kits for installation at the dealerships if purchased as an extra. I was told the mechanics at the dealership will be trained on how to install these components and they will be covered under factory warranty. This is supposed to happen for any car that is built or ordered after Feb / Mar 2016. You can purchase the whole kit or just part of the kit apparently:)
Any word on how much this is all going to cost as an option directly from the dealers?
Mustang Motorsport are charging $46k for the full R627 package..
Which include the full bodykit, supercharger, suspension, active exhaust, wheels, etc.
... I may have to wait til they start coming up for sale as second hand, but I want one!