In preparation, it would appear, for the MyMagic+ system, Disney has changed how far out you can do Online Check-In for your resort. Now, guests staying at a Walt Disney World Resort can check in up to 60 days prior to their trip. Previously, guests could only check in up to 10 days prior.
Online Check-In is a service that allows you to go to the special Online Check-In desk at your resort, where your Welcome Folder and your Key To The World card will be waiting for you. Proper ID is required at check in.
Guests who would like to participate in Online Check-In can visit: https://disneyworld.disney.go.com/guest-services/online-resort-check-in/