We've already reported that the next-generation Ford Mustang will be moving down size, and a new report suggests the next Chevrolet Camaro will be making a similar move. The next-generation Camaro is expected to bow in 2014 as a 2015 model.

According to Motor Trend, General Motors has given the green light to a plan to build the next-generation Camaro on a version of the company's upcoming Alpha platform. The rear-wheel drive Alpha platform will also underpin Cadillac's future ATS model and is even tipped to be the foundation for the next CTS.

As the Alpha platform will underpin three separate GM models, at least two different wheelbases are expected - a shorter version for the Camaro and ATS and a longer version for the next CTS. The next Camaro's wheelbase should stay similar to today's car, but look for its overall length to shrink by as much as a foot. This formula should allow GM to take advantage of the CAFE "footprint" calculation for required fuel economy.

Unfortunately for V8 lovers, the Camaro's engine bay will also be downsizing. The next-generation Camaro SS will likely ditch its V8 powerplant in favor of a turbocharged or supercharged version of GM's 3.6L direct-injection V6. Although total horsepower will likely slide from the current SS, the next Camaro will be lighter than the current car, allowing for equal - if not better - performance.