All the seating and cargo capacity of a motorcycle, with the visibility of a car! There's no way in hell I'd split lanes on that thing; when I'm on my motorcycle, I have no obstructions and can see all around me, and definitely know where the edges of my bike are. This looks like a low-slung claustrophobic nightmare. Even if it is a very technically cool thing.
Being two wheeled it will be classified as a motorcycle (at least here in California.. don't know if that is everywhere). Being a motorcycle gets you other privileges besides lane splitting like being in the HOV lanes and (in some places) special parking.