He'll probably be red and white. Usually the sables have a cap-like marking on their heads.
My Jack kept a lot of black-tipped hairs, but I was assured by an experienced breeder that he'd be considered red-and-white with sabling, as opposed to an actual sable. Of course I had another breeder say the opposite :-) But I believe usually the sable keeps the black cap on the head.
I would say red and white.