From the official Limited Time Magic Site:
Celebrate the release of The Lone Ranger by kicking up some sizzling summer fun at Magic Kingdom park! Find your way to Frontierland and beat the heat at Pecos Bill's, where you can buy a boot-shaped souvenir mug, "branded" with the Lone Ranger's logo. Fill your "boot" with a frosty root beer slush, or enjoy other offerings in the spirit of Disney's latest adventure film, including the "Masked Ranger Favorite"—a deluxe Angus cheeseburger with bacon, onion rings and all the fixin's. You won't want to miss this delicious offer, available for a limited time, thanks to a little Limited Time Magic!