I got an e-mail today telling me I can now do advance FP+ reservations and order my MagicBand. So either I was picked to test or they have sent this out to all passholders. I have to say I am excited to now be able to reserve things in advance, but the first time I am going, I am going with family who only have multi-day tickets, so I won't be able to use it that much. I might FP one of the key rides and we can do child swap since we both have kids. But we will have to wait until we get there to reserve the other ones. I wonder when they will allow multi-day passes who don't stay onsite to use the system. Maybe I should have them create a login and link their passes and see what happens.
BTW, it said 7 days within a 30 day period and I can reserve up to 30 days and up to 60 days if I stay onsite. And it is a rolling 7 days, so as you use one of them, you can book another within those 30 days.