"Breaking news" from the Be Our Guest podcast, which I never got out of the habit of listening to even after the DTOAL (1): The back end of FastPass times will be enforced during the spring break season.
This doesn't mean a whole lot in the grand scheme of things, but the advice given here about stocking up on FastPasses early to redeem them late may no longer be good advice. The rumored policy come March is FP returnees arriving more than 15-20 minutes after the back end of their FP return time will be turned away. So if your FP says 1:00-2:00, you will need to use it by 2:15-2:20 or it will be worthless.
Most parkgoers won't notice the difference, but I can see this eventually putting more pressure on the in-park restaurants to turn tables over and hit reservation times more accurately. We had a couple of times on DTOAL when our reservations weren't honored until 20-30 after our reservation time (2). It didn't matter much for us overall, but if a botched dining reservation made me miss a FP window, I'd be a bit peeved.
So it's a minor inconvenience for the ultra-prepared, but probably won't change the park experience much. If anything, it will make cashing in late FPs easier since there won't be a bunch of FPs from the morning stuffing the FP return queue.
It also seems to be setting up a long-term next-gen tech strategy for Disney. The mouse is planning a customized tech experience for visitors, especially those who stay on property. Things like customized news for returning visitors informing them of what is new/changed since their last visit, smoother Web/smartphone capabilities for dining reservations, etc. But the one next-gen thing this FP enforcement is pointing to is the possibility down the road for visitors to make reservations on popular attractions like Toy Story Mania. I could see WDW opening up the opportunity to book rides in advance as a perk for those staying on property, not unlike how people with on-property reservations can book dining reservations before the general public can.
Anyway, I have no idea how this will play out. I haven't checked any of the WDW messageboards, but I'm guessing there are from Patriots-fans-quality meltdowns going on there for the uberplanners.
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(1) DTOAL: "disney Trip Of A Lifetime", previously referred to in this thread as "MegaTrip". Name changed because it turns out MegaTrip is the name of a vacation-planning company I have no affiliation with as either a customer or stakeholder.
(2) Queue the scene from an early episode of "Seinfeld" where Jerry destroys a rental car counterperson. Paraphrasing "I don't think you know what a reservation is. If you did, I would have a rental car right now. Anyone can take reservations, it's the holding the reservations part that matters."