Well, not one day after Spielberg opened his big mouth, Paramount announced that they would do exactly what he predicted -- only for twice the money. Starting with World War Z, moviegoers in select areas can now pay $50 for the new "Mega Ticket" ("Mega" in this case meaning "Really Expensive"). The ticket includes a future digital copy of the movie, custom 3D glasses, a movie poster, and a small popcorn (yes, a small one).
A single unpopped kernel in this thing costs you like a buck.
If this pays off, you can bet your ass more studios will start doing it. But that's for big budget movies. As for smaller ones, well ...