Hyperspace Mountain will only be a seasonal overlay for Disneyland's Space Mountain. The attraction will be reverted back to normal after the "Season of the Force" event ends. Hyperspace Mountain will not come to Walt Disney World (at least, that's not in the current plans).
Space mountain at magic kingdom cannot handle the extra weight needed for audio on the trains without a complete overhaul.
I hope an indoor venue for Jedi Academy allows for walk through visitors to watch. This stage show is dynamic, every changing because the kids are always different. Its presentation outside Star Tours has been a great "hey, lets stop and watch" activity for many years. By moving indoors they risk losing the overall ambiance associated with this sort of 'street performance.' And with the introduction of FP pre booking etc, how long would it be before the audience consists of nothing more than the people accompanying the kids in the show - and nobody else.
Moving under cover (anti rain) is good, but it will die if it becomes closed to casual viewers (either by design or as a result of nobody but participants knowing what's going on inside).