High end BMW's have had something like this as an option (very expensive) for a while now. It's done in a much more elegant way than here in the article posted, the virtual distance the display is at is at roughly the same distance as the stuff in front of your car where your eyes are focused so there is no need to re-focus all the time.

There are some pretty tricky optics involved in getting a light path of the right focal length in the room just under the windshield and the first part of the bonnet so the image appears at the right distance.