I think the Challenger looks fantastic, there's no question about it. But... It is basically a mid-cycle refresh, just as the Mustangs got in 2010 and 2011. At some point it will get a complete redesign too and it may not look quite so retro any more either.
I just want to know what "theme" a previous poster was referring to that the other Mustangs built from 1974-2004 followed but the 2015 doesn't. Just because the current Mustang has a retro design theme and bears a strong resemblance to the first generation cars doesn't cut it in my book. For 30 years the Mustang never looked anything close to the original or current generations. Yet Ford sold a lot of them. So... What "theme" would that be?