Actually I think these guys are for real and on to an approach that might help develop the technology. Most electric cars up to now have had zero automotive appeal and performance to match. Tesla has Lotus making the chassis and are shooting for some good performance numbers. By making it work at the high end they may have a chance to make an everyday electric actually work.
What does make me skeptical of their schedule and ability to meet their goals is that you don't see any video of a running car front and center on the site (unless I missed that). I'd like to see more than dark still images of the car's details to be fully convinced.