Sorry to bump an old thread, but I think this is a great idea. I thought of something like this while I was watching a movie tonight. It'd be great to have a few lessons to prepare for a movie, maybe they could be broken into lower, intermediate and advanced vocab/phrases to know and look for in the movie. There could also be a follow-up lesson that can include spoilers so you can talk about specific scenes with regards to the language and how it was used.
I would say it doesn't have to be only new releases, but probably stick to either newer movies or classic/well known movies that are easy to rent, etc.