With a movie style theme park, there really it only two ways it can go. I'm very glad they've taken Hollywood Studios in the IP direction, no doubt inspired by the success of Universal's Wizzarding World of Harry Potter. These types of immersive, story driven experiences are much more marketable, and make a much more pleasant park to experience.
If I were to guess what the behind the scenes concept would look like, I'd probably base it off of Walt Disney Studios in Paris and the original Hollywood Pictures Backlot area (now known as Hollywood Land) at Disney California Adventure. These areas have, or in the case of Hollywood Land, had, an abundance of thin, sparsely themed facades, plain bare walls, concrete and tarmac walkways, corrugated iron facades, etc., to put simply, they aren't / weren't at all very nice places to be, even if they were accurate to what they were trying to represent.