My dealer said the same thing. Dealer stock comes first; special orders come later. My dealer ordered an identical car to mine and said I could have it when it comes in. I noticed that at least one other poster said their dealer offered to do the same thing.
2010 GTRR in 5.0 Magazine [http://www.mustangandfords.com/featured-vehicles/m5lp-1212-2010-ford-mustang-gt-rr-total-fabrication/viewall.html]
2015 White SC, PP, etc....