Cars? Depending on the resolution (and they are using nanoparticles, while film used grains of silver) we're looking towards having holographic computer displays in the near (?) future.
The way a hologram (that uses film) works is, you take a laser and a dark room and unexposed film. IIRC (and it's been almost four decades since I took that class) you split the beam, and illuminate the film with one half of the beam (focused IIRC) and the subject with the other.
When you develop the film there's nothing recognizable on it at all, just refraction patterns. Shine a laser at it and it changes to a grainy 3D, but a true 3d. Focus your eye at the foreground and the background gets fuzzy, move from side to side and see different views.
A holographic computer display would need a freakishly high resolution LCD panel backlit by three lasers, each tuned to a primary color. Maybe these silver nanoparticles are the ticket?
Crap, I could have saved a lot of writing with a link to wikipedia, which is most likely more accurate and surely more detailed. Hell, google if you're interested.