Earlier this month, Burger King put out a Press Release and unveiled a Gluten-Sensitive List for guests with "gluten sensitivity." Along with the burger patties, fries, salad, tacos, shakes, and soft-serve ice-cream, they also have their Tendergrill Chicken Breast Filet on the list (no bun of course). There are plenty of breakfast choices as well.
I'd still like to call on Burger King and other fast-food chains to look into stocking gluten-free hamburger buns so people on gluten-free diets can eat a burger the old-fashioned way like everybody else. There's no need to "reinvent the wheel" and formulate their own gluten-free buns, either. There are many varieties of good gluten-free buns available (Kinnikinnick, for one), and it would simply entail having them on hand (even in the freezer) to quickly defrost when a gluten-free guest requests their burger with a gluten-free bun.