Still only design studies for a concept car...I won't hold my breath! Whilst standing is alright for short journeys it is stupid for any length, and for older and disabled people...no surprise that designers tend to be young, affluent and fit, and design ideas around THEIR idea of fun!
As for the safety of standing ON a motor vehicle rather seating set-belted INTO a protective shell...do they really think transport officials will welcome that?!
As for looks, 2 front always look better to me for handling, and almost always look better for styling, with very few exceptions!