I love:
The front end, nice mix of updating the classic Mustang look.
The interior WOW
The retro-look numbers on the gauges... and being able to customize the dash lights and stuff...sweet.
I like how they moved the fog lamps to mimic the Early Mustang GT.
The ass end, needs some work, but we are seeing it somewhat out of proportion to the whole car. It may improve once you see it out and about.
Also dont like the square console, it should be more rounded/tapered.
I half expect the concept taillights and rear bumper cover, hood, quarter window covers and front-end treatment to show up on a Special Edition, maybe a SVT Mustang or something.