For the roof and hood carbon fiber would be used. The aluminum and carbon pieces all put together would shed about 441 pounds and possibly get the curb weight in the 2500 pound range which is hard to believe.
The costs supposedly are justified with Audi using similar materials as well as aluminum pieces that already are being produced for the new Golf. The car also will be front wheel drive but with a trick new diff taken from some of the all wheel drive models providing better traction.
Just what will this super 40th Anniversary Carbon GTI cost? No ball park price is stated and whatever that price may be, they should build this car. It would be quite the anniversary gift to the VW faithful.