Smash newcomers are always hard to predict. Somethimes they're very obvious, but sometimes very obscure choices are made. I've been trying to avoid predictions since they're so boring, but that Chun-Leak is easily the safest leak out there to speculate something out of it. I'm not implying the leak's real, but it makes most sense than most leaks until now, due to all the detais and moment it was revealed. My most safe prediction is this and i'm going to explain why:
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Since the second fighter pass in following a pattern of reuse characters and assets which couldn't be added in the base game, it'd be obvious to add some of rumoured stuff here. Chun-Li and Lloyd/Yuri are the safest pick out there according to the leak, while Cinderace is the most likely choice for a gen 8 Pokémon. Chun-Li was rumoured to be in the base game, then was replaced by Ken. Lloyd/Yuti were also rumoured to be present in the game somehow. As for Cinderace, it's safe to assume a gen 8 Pokémon in coming, whenever you want it or not, and yes, is also safe to assume there'll be another Nintendo character in this pass. Let's remind that the fighters from pass 2 were decided at late 2018. Pokémon Sword and Shield were being developed at that time and Sakurai probably received some gen 8 Pokémon concepts to adapt to a fighter. Little reminder: Greninja wasn't even revealed to the public when Sakurai received his concept art from Game Freak to work him as a fighter in smash 4, so the same could happen here. And don't lie to yourself, you know Nintendo/Game Freak WILL push a gen 8 Pokémon to this fighter pass. God knows when another smash title will be released and it'd be a great opportunity for them to them bring a new 'mon to the roster as DLC.
Also, this line up would follow another rumoured pattern: all season 2 characters would come from companies already existing in smash: Microsoft, Squenix, Bamco and Capcom.
Happy or not, this is by far the most reasonable fighter pass 2 prediction you're going to see out there.