According to Eat This, Not That, McDonald's is testing a Chicken Big Mac! The sandwich will be exactly the same except the beef patties will be replace with crispy chicken patties! The Chicken Big Mac is currently being tested in the United Kingdom, and will make its way to the states at the end of August! McDonald's says:
"While not everything we test makes it on our U.S. menus, we'll use this time to gather feedback from both customers and restaurant crew as we consider opportunities to offer more delicious options in the future,"