Illegal in nearly every U.S. state.
Nevada might be the only exception.
It would probably be badged as a Porsche here, priced at $6,000 plus dealer prep, transportation, etc.
And banned in commuter lanes nationwide.
Actually makes more sense than the Chevy Jolt too.
I doubt it will ever be offered in the U.S.
Why do you say that?
Many states, including Virginia, currently define a motorcycle as simply "...any vehicle with three wheels or fewer in contact with the ground...". So, at the very least they could be registered as a motorcycles (which, by the way, would allow them to be operated in HOV lanes).
Also, legislation is being proposed in Virginia during the upcoming session which will allow 3-wheeled vehicles which are designed to be controlled via a steering wheel and foot operated throttle & brake, and which have a factory supplied roof/top as automobiles.