So here I am right now listening to ESPN radio and I heard a commercial for Dominos Pizza. At the very end in a speedy voice, said voice says "GF pizza might be extra" or something to that effect. I had no idea they even offered one.
Having said that, anybody with any severe gluten issues shouldn't even think about ordering one. I can almost guarantee that they'll be cooking that GF pizza in the same oven and on the same racks as the regular pizzas(like most places).