Two of the most eagerly anticipated debuts of the year have arrived at the Detroit Motor Show. The all new M3 Sedan is on display in its launch color of Yas Marina Blue, while the M4 Coupe is sitting pretty in Black Sapphire, showcasing two hues from the cars' color palette. Under the skin the cars are identical, with power coming from a 3.0-liter twin-turbo inline-six. They also sport similar front ends, although at the rear the M4 features an integrated rear spoiler whereas the M3 wears a Gurney spoiler.