With the first of the 2015 Ford Mustang being released in the next couple years it was merely a matter of time before Ford would certainly begin testing out prototypes. It appears to be that time as come, as secret agent photographers have captured a 2015 Mustang prototype being tested on public roads. To the untrained eyes the car might look like a test mule based on the current 2013 model, yet underneath the bodywork is hiding the particular chassis and suspension being created for the next generation Mustang. The evidence is within the photos, which show off the newest rear suspension setup for the new. The current S197 Mustang platform was tested with an independent rear suspension system as well, but all reports suggest that the next generation Mustang will most surely lose the solid rear axle. With 2015 Mustang prototypes now out on the highways, expect to see more and more spy pictures of the cars during testing. Ideally sometime in the near future we’ll start to observe development mules with some of the brand new bodywork, giving us an even much better idea of what the 2015 Mustang may be like.