Nintendo has confirmed an exact date for the release of the Bayonetta and Corrin DLC for Super Smash Bros through their Twitter feed.
— Nintendo of America (@NintendoAmerica) January 31, 2016
This awaited DLC will be available to purchase on Wednesday, February 3, 2016 in the afternoon for North America. Bayonetta is from the title of the same name (as well as its sequel) on the Wii U and both the male and female Corrin fighter hail from the upcoming Fire Emblem Fates on the 3DS.
At the same time and date, the sixth wave of Mii fighter costumes will also be available to purchase.