In case you somehow missed it, Corrin and Bayonetta are now available to purchase along with an update for version 1.1.4 of the game.
In addition Mii outfits and hats are available. Umbra Clock Tower Stage comes bundled with the Bayonetta Fighter DLC. Check your local eShop for regional pricing.
Efforts are underway to determine what buffs, nerfs and other changes have been made to the game with 1.1.4. You can find the Smashboard thread for that here.
Having tried both characters Bayonetta definitely has huge potential. Corrin also has good aspects to him but only time will tell where these characters will end up in the overall meta.
Call to action: Purchase both Corrin and Bayonetta Fighter DLC and let me know below what you think!