As confirmed at the recent Nintendo Direct, the final DLC for Super Smash Bros. Ultimate will be revealed later today at 7 AM PT / 10 AM PT. It will be revealed in a new episodes of Mr. Sakurai Presents, with director Masahiro Sakurai taking a deep dive into the DLC and everything it will add, which will include a new fighter, a new stage, and new music. You can watch the presentation when it goes live below.
As Nintendo and Sakurai have stressed more than a few times, this will be the final DLC fighter to be added to Super Smash Bros. Ultimate. The game launched in December 2018 and has seen regular DLC additions across two separate fighter passes. The second fighter pass has until now brought Min Min from ARMS, Pyra and Mythra from Xenoblade Chronicles 2, Steve and Alex from Minecraft, Sephiroth from Final Fantasy 7, and Kazuya Mishima from Tekken.
The sixth and final DLC of the current fighters pass will bring the total number of playable characters in the game to 82.