I was also worried, but I sent ford an email letting them know how upset I was about their production, and told them I was very concerned that I will not get mine. Then I told them I cant wait much longer, as I am going to be forced to purchase another vehicle seeing as I traded my old vehicle in at the dealer to order the mustang. and My next purchase will not be a ford.
2 days, I got two calls from the dealer stating that ford called them to confirm I still wanted my car so they can push this order through. I then received an email back from ford stating I was serialized and awaiting build. I think they really took it in the back side on these mustang GT production figures.