Here's what the always astute Steve O'Donnell said regarding the development of the Gen 7 last year:
I don't really know what that means, regarding cool technology they can (pretend to be) putting in the car. The philosophy seems to be what can they do to attract younger fans, which is a business necessity for them.
The just announced Mustang entering Australia's V8 Supercars in 2019 sure looks cool:
That series has some pretty complex regulations that are intended to achieve aero parity using bodies that look much closer to production models, but I am going to guess that quest is actually more difficult on high speed ovals than on road courses. However, if they could get closer to something in that vein cosmetically, it sure might attract some eyeballs that are bored by the Gen 6. The Gen 6 has been improved during its lifetime, but sleek and sexy are not exactly the words that come to mind.