From a little bird:
TM previews will include a walkthrough of the FJ queue, but not the ride itself. Also, TMs will be receiving 50% off food and drinks (not alcohol), so the restaurants should be open. Get ready for reviews of butterbeer (and vodka, perhaps...)!
Why no FJ? I honestly don't believe it. They're doing 4 nights of TM previews -- my prediction is that they will run it when they WANT to run it. By stating that there is no FJ experience, they dissuade the uncommitted and avoid committing themselves to constantly running the attraction for TMs. Whoever happens to be in the queue at that time will strike gold.