RAFAT will be moving to Waddinton, probably towards the end of next year. Their accommodation is already being built. So it follows that once they've gone, Scampton will be abandoned as has been predicted for years.
As for the movie, I believe Stephen Fry is writing the screen play isn't he? I doubt if he'll be letting the story to be Americanised at all. I aslo heard that most of the aircraft imagery was going to be computer generated so if that's the case, I guess it's irrelevant where it's filmed. No doubt it'll be a load of garbage though, even with Mr Fry's input. Presumably Mr.Gibson's dog won't even get a mention...