To answer your question, we get the “Review” magazine that lists all film companies and their scheduled releases, as well as the list of movies that are “waiting to be greenlighted.”
The reason we get the info before anyone else is because we have to BID to get the movies at our theatre. Each print of a movie costs in the upwards of $10,000 a pop!!! That means if I ruin a print of a movie through a “brainwrap burnout”, or the film getting eaten by the projector, that's $10.000 on MY head.
We also view the films before they hit the public. It only makes sense that theatre workers get this info ahead of time.
Gotta go, our theatre's showing GHOSTBUSTERS tonight, and I have to do promotions!!!