Nintendo has released Super Smash Bros. Ultimate’ s 12.0.0 patch which brings along support for Kazuya as the latest DLC character, as well as a new Tekken stage and music tracks. There are also, new Mii Fighter costumes can be purchased separately.
The new update should download to your system automatically, but you can grab it right away by going to the Switch home menu, selecting the Smash Bros. Ultimate icon, pressing the “+” button, choosing “Software Update” and finally “Via the Internet”.