The fact that there's a screen on the unit makes me wonder if they'll do something like what Universal Orlando did shortly after it opened (but which disappeared when they instituted the express pass for purchase or on site).
You would stick your ticket in the machine (just like with fast pass) and you'd have a choice of 2 or 3 return windows. Possibly that's how these will work (with the added possibility of being able to do some reservations in advance).
You would stick your ticket in the machine (just like with fast pass) and you'd have a choice of 2 or 3 return windows. Possibly that's how these will work (with the added possibility of being able to do some reservations in advance).