Just saw a document being sent out to USA dealerships regarding allocation.
Regarding available units, it only states that there will be a "very limited" supply.
Order guide will be available October 01, and Order Banks will open October 12, with vehicles arriving in dealerships Spring 2016.
Production begins in January 2016.
Dealerships who have had good sales number of Fiesta/Focus ST will get priority allocation, or how Ford words it "earns allocation". It goes onto say dealerships who do not earn allocation, Ford will make every effort to schedule and build retail orders as production allows. (yeah good luck with that)
I am not going to post the document as I am sure it is not for public view.
IMO regarding RS production, history of past RS production has been be a 2 year run only. Which fits this model as well, with 2018 being the change over to the MK4 Focus.