The new burger's key feature is an orange-colored, cheddar cheese-flavored sesame seed bun. While the build-out from there varies between the three countries, they all include a flame-grilled beef patty, cheddar cheese, mayo, lettuce, and tomato.
Colored buns for Halloween have become somewhat of a "thing" for Burger King in a number of countries, including here in the US where they offered a steak sauce-flavored, black bun for Halloween just last year. The black bun is also back for Halloween this year in a number of countries, including Germany and Singapore.
While it's debatable whether the orange color gives the Orange Halloween Whopper a more pumpkin-like appearance, it should be noted that the chain also once offered a burger with actual sliced of pumpkin in it.
Photos via Burger King Finland.