I'm really surprised by the negativity around the new Stang's looks. I like the evolution -- it's appropriate. Remember, the Mustang is a brand in and of itself, just as the Corvette is. To me it's an evolutionary update to an iconic pony car. If it was completely reimagined, most of the fans who speak the loudest (ie. those who actually BUY Mustangs and not just talk about how crappy it is on the internet) would be up in arms over it. I think this was a smart move by Ford.
The interior is reasonably updated too. It's not a Lexus LF-A inside, but then it doesn't cost as much as a house either. Reasonable updates.
I drove a GT last week, right after the Hellcat and a Stingray. In comparison to those two (which of course were each at least $25k more costly than the Ford), the Mustang felt delicate and soft. Still a fun car to drive, but the steering is light and the clutch is light and the shift action is light compared to the other two. The Hellcat makes you grow chest hair just by sitting in it. It requires a deliberate action to drive that car -- heavy (by modern standards) clutch, a shifter that needs a bit of arm muscle and enough cajones to actually stomp the go pedal.
The Vette was the perfect middle ground though. Visceral in all the right ways, yet fluid and nimble in its actions too. It still feels heavy and lumbering compared to a Cayman or Boxster, but as far as 'Murican performance cars go, it's a solid leader. If GM can make a Stingray-lite with a backseat as others have suggested, it could really and truly be great.
In the meantime, for the more affordable pony cars, as much as I like the 'Maro, its got too many failings for me to choose one over the new GT.