The Mercedes-Benz C-class EV will be revealed in full on April 20, but we're getting a first look at the cabin today.The C-class EV follows the lead of other new Mercedes models in offering the dashboard-spanning Hyperscreen.The electric sedan will also offer a Burmester 4D surround-sound system, a panoramic glass roof embedded with light-up stars, and a new vegan cabin upholstery.