CONCEPT IAA is a one-off prototype, a show car, but it is also a proper runner. Under the mildly outrageous bodywork – a CAD/CAM-generated, milled-from-solid, big-money styling statement – the drivetrain is straight out of the C350e plug-in hybrid, the chassis an improvised parts bin compilation. Why does it exist? To showcase Mercedes’ latest design (interior and exterior), propulsion and aero thinking, and in some style. This is a futuristic yet strangely mature family car, one that leaves a lasting impression, not least because, unmissable extending rump aside (preposterous, you might think, until you consider the benefits, and even then…) there’s much here that will see production, and that we’re now impatient for.
The most spectacular function of the car’s body is the extending Kamm tail rear end, which grows…