It's just a face lift....just like 86/87 and 98/99 was.
Chassis and basic shape won't change. They might continue with the retro theme and add some "hips" like the new camaro challenger and charger have.
I wouldn't count on a retro fox body. How many cars from the 80's actually look decent by today's standards?
Ford practically denies the existence of the '79-93 Mustangs anyways (which still baffles me to this day considering their popularity) so i don't think it would EVER happen, unless 20 years from now there's some old school Fox lover high up in the Ford food chain and makes it happen, but even then they'd probably screw it up