I thought the wording from Blog Mickey was interesting and def sounded like something that was sent to him, not what he wrote ... it implies the pass must be activated. We will find out on Thursday, just thought it was very particular. I can't remember any exact wording with the Guardians, DS#2 only had a voucher and I think when I tried to register he could not get one so I decided not to go.
When registration opens, Passholders will be able to register themselves and up to 5 other Annual Passholders. Non-Passholders will not be allowed to attend the preview.
In order to register more guests than just yourself, ensure you are all joined under the “Friends and Family” feature of My Disney Experience. Only one reservation per Passholder will be allowed. Each person in your party must have a valid, activated Disney World Annual Pass, and pass blockout dates apply. Disney World is expected to announce more details shortly.