I think the news is that this version of the car is available through Chevrolet dealers nationwide.
It's a 580 bhp option on any C6:
Coupe Convertible, Manual or Automatic.
For $18,900.
Built at a Callaway facility, warranted, emission compliant, documented, and much faster than a Z06, for less money!

On the contrary: I was at the unveiling at Pebble Beach and this car was definitely the star of the show in 2007. Probably the best looking, and most finely crafted example of North America design this observer has ever seen. hats off to the folks at Callaway who seem to do an extraordinary job with a small staff and budget. Moreover I have spoken to Callaway owner after owner who seem to be thrilled with their cars, and this over 30 years! I would watch these guys carefully..
This car has 700 bhp, exclusivity and fit and finish worthy of a Delage. 300k is cheap!