Does anyone know if for DVC previews, you have to already have a DVC stay booked at the time they are offered? Or could you book a stay after reserving a preview timeslot/make a reservation quickly and then book a timeslot. I know this is all hypothetical, but I'm wondering how it worked for Pandora. If you have to already have it booked before it's announced then there is no point in me even trying that route and I'll just be at the mercy of AP previews.