I was able to change my order today... and still get my car around the end of October. Pretty neat that 2016 has the new/better Sync, some decent, if mostly more conservative paint choices, and standard Rado Gray wheels. I was going to go for the ebony black, but the gray I believe will look cleaner, and not show nicks and scratches as fast as the black wheels. I think some paint choices and the new Sync, along with the passenger Recaro being only 4 way instead of 6 way adjustable are the only real changes. The 2016 also is almost $2000 cheaper for me than the 2015. It's currently $22900 loaded up with everything but the extra cost tri-color paints, ebony black/red caliper wheels, moonroof, and exterior "protection package."
I'm of a mind to think 2017 will give us a new Fiesta, but I doubt there will be an ST that first year if the refresh is large. Regardless, I absolutely need a car by the beginning of November, so waiting another calendar year is not an option for me.