I think the new rear is sexy. Kind of (not surprising I guess, considering the plan to sell the car worldwide) European-looking. I don't know about the frontal styling. But in one of the videos there is a head-on shot of the car approaching the camera, and those LED "gills" actually give it a pretty aggressive look.
One of the things that turned me off the current Mustangs is the interior is pretty low-rent. A lot of cheap hard plastics. I knew someone who got one of the first-year 5.0 GTs (2011?) and I thought the interior of my much older GTO was nicer than the Mustang. So if they really did improve the materials and quality of the interior that is a huge leap forward in making the car less of a compromise (i.e. no longer having to say "yeah the interior's cheap but it goes fast!").
The washer fluid is NOT fine!