McLaren will debut another car at the 2015 Geneva Motor Show together with the much awaited production-intent McLaren P1™ GTR. It will be a long tail variant and is actually a competition car that will be competiting in the McLaren Super Series.
The name is based on the McLaren F1 Longtail race variant from 1997. I remember reading a magazine about that car and it was a stunning piece of work. Of course, I was just a greenhorn and just started being a lowly paid corporate slave, er, paper pusher.