The possibilities as you mentioned are limitless, and definitely this can be something, that behaves just the same way as Iron Man's gadget's do, however, a slight difference will be that water vapours provide a surface that can get easily distorted by flow of wind, and might not seem that cool, when compared to a projection on a solid glass surface or some other transparent surface of other material.<p>But if one can compromise on this thing, then surely it is worthing trying for. Real good mix of technologies.