http://www.wired.com/2013/12/lamborghini-sogna/#x
The Lambroghini Sogna. The surprise for me was that it wasn't done by Luigi Colani.
The 2015 Alpine GT6 Vision GT is only in Gran Turisimo 6? Then the Red Bull X2014 concept qualifies:
http://www.wired.com/2013/12/red-bull-x2014/