A Charger enthusiast could argue that the current charger is not a "real charger" because it is a 4 door. Really, the new Challenger is what a new Charger would probably be if it had stayed in production: a big, mean, powerful coupe. It is a little on the large/luxurious side to really fit the pony car niche (at least according to me, the expert on all things automotive

)
I would agree with Riptide that the Mustang/Camaro were always Mustang and Camaro, just steadily evolving/morphing designs.
For an example of the evolution:
http://www.youtube.com/watch?v=9WAZkPukKg4