To be honest it's an idea that is very overdue in cars and bikes, although I believe that some of the top end luxury cars have HUD as an option now. The trouble is that if you're going to be doing something like this you need to be doing it as in integrated unit rather than a bolt on add on like that.
The reall USP killer application would have been GPS / direction indication however I think that has been taken over now by voice prompting. At that price tag I think it's going to remain one of those 'coo, wouldnt that be neet' products.