I have to say, even though the exterior is not awe-inspiring, the interior is a definite improvement. The current interior looks cheap with excessive chrome. The new dash has some dimension to it that wasn't there before.
At least the Challenger is really great-looking. Even it's overwhelming weight isn't that much a problem because there's a lot of power to match.
The Camaro has the advantage on power-weight ratio and a balanced style of new with old lines. While the Mustang currently has a look of similar style, a refresh will violate that look with too many awkward features.
I'm so grateful that GM got this right by consulting enthusiasts.