He's part of Challenger Pack 11, which also includes Mii Fighter costumes inspired by Splatoon (an Octoling wig and Judd) and Doom (a Doom Slayer outfit for gunners).
Sora excels at airborne fighting, and is lighter than Isabelle and Young Link, Sakurai noted. He didn't reveal Sora's Final Smash super-move, saying he wanted players to see it for themselves, but noted that it's called Sealing the Keyhole. His stage is based on Hollow Bastion.
Kingdom Hearts is known for its sweeping score (composed by Yoko Shimomura), and with Sora will come a bunch of tracks from the series -- Night of Fate, Destiny's Force, Shrouding Dark Cloud, Hand in Hand, Blast Away (Gummi Ship II), Hollow Bastion, Scherzo Di Notte, Fragments of Sorrow and Destati.
If you have save data for Kingdom Hearts: Melody of Memory on your Switch, you'll also get a bonus song -- a swing version of series title theme Dearly Beloved.
You'll also be able to play the Kingdom Hearts series -- Kingdom Hearts HD 1.5 + 2.5 ReMix, Kingdom Hearts HD 2.8 Final Chapter Prologue and Kingdom Hearts 3 -- on Switch via cloud gaming, Sakurai revealed. However, he didn't say when they'd be available.
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Smash Bros. Ultimate has been a massive success for Nintendo, selling over 25 million units since its December 2018 launch. Since then, the company has brought out two DLC packs of additional characters, which are called Fighter Passes.