During the Smash Bros 4 NicoNico stream, Corrin and Bayonetta were briefly shown in an exhibition match. Moments later, Nintendo America posted a tweet with the exact date for Corrin and Bayonetta DLC to be released which will be February 3rd.
Bayonetta and Corrin come to #SmashBros in the afternoon Feb. 3! pic.twitter.com/9D7R26s0cU
— Nintendo of America (@NintendoAmerica) January 31, 2016