Standard procedure. F-150's were on the locator (built but not shipped) with EPA ratings on the stickers long before the ratings were announced by Ford, same was true of Bronco Sport.
Everything Mike L says needs to be taken with a whole strip mine's worth of salt. And is anybody actually using EPA ratings as a deciding factor when ordering a Bronco? Know that it will be less than 25 but more than 15.
My '78 Bronco got 18 miles to every 2 gallons and I still drove it. My '70 got 9 MPG with the 3 speed and a carb. Have not done calculations with EFI and 5 speed. But it is way better than 9 MPG. If you are worried about MPG buy a Vespa.