If they had a black Lumia 920 in the Dark Knight Rises...

[snaqvi91]

...that would have been epic. I'm sure people would have flocked to get one. That's assuming either Batman or Bain used it.

 

[tissotti]

Nokia had 5800 XpressMusic back on The Dark Knight. It worked as a teaser as the phone was launched after the movie.

It would be cool to do something similar with the next Lumia flagship, but i can imagine doing something being extremely hard as companies like Nokia got countless of prototypes going around and the development cycle is around 8-14 months.
You would need to have some kind of dummy phone for the movie on the movie shoots already and also know that the design would go on sale.