Both the Pop Century Resort and the All-Star Resorts are now testing the MagicBand with all guests.
This has started with all guests arriving on or after December 2, 2013 at Disney's All Star Sports Resort. Then on December 4 or later, All Star Music Resort. Then finally on or after December 6, All Star Movies Resort will join the test. Disney's Pop Century Resort has already started the test.
Here's what Disney had to say:
Guests will continue to engage in MyMagic+ testing in the same way that all other resort Guests do. Upon check in, Guests will receive their MagicBands if they did not receive them at home after customizing them in advance using My Disney Experience.
Front Desk can provide an RF-enabled Key to the World card if a Guest requests it instead of a MagicBand. The RF-enabled Key to the World card functions the same way a MagicBand does at touch points. Guests with RF-enabled Key to the World cards will touch to enter their resort room and theme parks and water parks (with valid theme park admission), touch to pay (optional) and touch to redeem FastPass+ selections (PLEASE, NOTE: If a Guest is issued a Key to the World card he or she will NOT be able to get FASTPASS tickets when in the park in addition to the FastPass+ selections. That is because the magnetic stripes are not active on Key to the World cards issued to Guests participating in this test; therefore they will not work in FASTPASS machines)."