It is not actually retinal projection, I have been looking into it quite a bit. It uses a scanning element that is very similar to the Private-Eye P4 (One of which I own, actually).
Retinal projection is pretty hard to do in real life, as it has such a tiny exit pupil, and only works if you are looking straight forward. I would not count on seeing it for a long time, if ever.
Sign me up for a direct optic nerve connection, though!