I'm hoping that will work for the Apple Watch.... I won't hold my breath, but that would be awesome!
By then I expect more to be on the bands.
Here is an example. There are no paper fast passes - all on your ticket (short range RFID) or band (long range RFID). You must scan your ticket on the way in - no more "mom carries the fast passes and hands them over" - then you must scan the card or band again before getting into the area where you could not jump the line. This makes the cards a pain - did that one day and was ready to buy bands over waiting for our free ones. Ride pics? A lot of them are doing long range RFID scans on the bands and they just load, others you have to touch your card to the reader.
The app holds all the info. Sure you can print that out, but you aren't going to want to do that. You might want to change your Fps while waiting in line, or better yet - check the wait times for rides that are updated like every 3 minutes. Very helpful getting off the boat from the Studios at Epcot knowing if we book it Soarin had a 30 minute wait (that was more like 15!!). You have a small window of things like that - because everyone is checking wait times. Your fast passes might all be in the evening - like ours tomorrow, they don't even start until 4pm!
It will be a different trip than you are used to for sure.....
I still have some of the special ones here..... they are too pretty to use!
Very cheap - i'll be surprised if you can manage that in 2 years. Prices are going up - i'm blaming the dining plan. Snacks are crazy expensive, and even today you would be hard pressed to get lunch and a drink for under $10 (unless you use kids meals at $7). The app has most of the meal prices - so you can plan that way.
We are local (50 miles away), we have annual passes (was the kids Christmas gift this year). We have been.... gosh, it looks like 12 times since we got the passes October 7th. Between gas money, tolls and food - if we didn't pack lunches we wouldn't have been able to go as much. Some trips were just a couple of hours because we were in the area for other reasons.
I get not everyone wants to eat PB&J, heck, I don't even LIKE them! BUT, for us it is the difference between going 12 times or not. Trust me, they are fine with it.
Now if it was an "every two year" vacation - we wouldn't be doing it, but they gladly packed when we had the chance to stay in Kissimmee for a couple of days and day trip. Hotel cooking at its finest!
I'm excited about the Apple Pay aspect - I don't like carrying my cards for the remote chance I need to buy something, this way I can know I have it with my phone handy should the need arise.
ETA: That dumbo popcorn thing is cute - i've only seen creepy ones so far... i'da bought Dumbo! 
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YES!
That is what I was told yesterday was going to happen!!!!
Happy Dance!!!!!!!