[KarFan]

It'm important to realize that GM will have to adapt the Alpha platform for a 6th Gen Camaro. Camaro will have a different set of performance and component requirements than the current ATS, suspension, brakes, and a stronger trans and IRS to handle powerful V8's. Thus GM will have to strenghten the platoform to support the more robust and powerful components and the weight savings won't be as much as say the difference in curb weight between an current ATS and the 5th Gen Camaro.

The goal will be weight savings gram by gram throughout the cars development however there is only so much that can be done on the platform level. The heavy components that we all want, V8, strong transmission, heavy duty IRS with suspension and high performance brake systems are all heavier than saw what is currently offered on say a Turbo 4cyl ATS M6.