I am staying at Pop Century in October and I have my Magic Band and have been able to make Fast Pass + selections. I have another trip planned for November with the rest of my family and they are not eligible for Magic Bands as of now. I spoke to a CM and they said that the rest of my family will be eligible for Magic Bands since I already have a Magic Band as long as the resort that we are staying at is testing. The CM member told me that the following resorts are testing until Oct 29th: Animal Kingdom Lodge, Art of Animation, Beach Club, Contemporary, Pop Century, Polynesian, Port Orleans Riverside, and Pop Century. The CM also told me that in Sept that they would know which resorts were going to be testing in Nov.