It's a $20k, street-legal, EV modding platform. Sounds like you can mount your own infotainment system. Just an electric motor, battery, and chassis, and the rest is up to you. Isn't this what we've been asking for?
replies(5):
edit to add: if Slate is successful, I wouldn't be surprised if a decently sized ecosystem pops up around easily installed custom sound systems and the tablets (possibly with headphone jacks!) to control them.