Since the M3 and M4 are essentially sedan and coupe versions of the same model, don't expect any real differences between the M3 CS and the M4 CS. Look for a power output of 460 horsepower, up 10 stallions over the M3 Competition Package. The car will still use BMW's 3.0-liter twin-turbocharged inline-six. Power will be sent to the rear wheels through a seven-speed dual-clutch transmission. Don't expect a manual option to be available. The M3 CS should hit 60 mph in just under 4 seconds.
The suspension should be generally the same as that on the Competition Package. The biggest change to the ride and handling will be the staggered wheels wrapped in Michelin Pilot Sport Cup 2 tires — the go-to choice for any high-performance car today. The Active M Differential should have a specific tune just for the M3.
As the spy shots show, there are a number of visual changes to the car. It looks like the hood, roof and trunk lid are all made of carbon fiber. A small front splitter also looks like it's made from carbon. We don't have any photos of the interior, but, like the M4 CS, look for lots of Alcantara and lightweight door panels with pull straps.
No word on when the car will debut, but since it's really just a model variant, don't expect BMW to keep it under wraps for too much longer.