I saw some of the things from the Expansion Pass before the quarantine started, but I wasn't sure if I should post it or no before. I'll start with the first part of the EX Pass:
>there are no new Pokemon other than Kubfu and Urshifu
>there will be no more new Gigantamax forms other than the ones shown, but we'll get some more Galarian forms
>Galarian Dustox and Beautifly - Dustox will be a fairy/poison type and will resemble Klara's bowtie. Beautifly will be psychic/flying type, and will be mostly black and white
>the main story revolves around evolving Kubfu, but there will be a side quest with Klara or Avery, which will reward you with an item to evolve Galarian Slowpoke when completed
>Galarian Slowbro is a psychic/poison type, it has purple forehead and a tip of tail, Cloyster is attached to its arm, not the tail. It can use the Cloyster as a lance.
>there is a second smaller sidestory which allows you to get own tempo Rockruff
>there will be a way to get another Kubfu which you can evolve into the second form of Urshifu

Now the 2nd part of the expansion:
>the person who you work with in this story is chairman Rose's brother, Bernard Rose
>main story revolves around finding Calyrex and awakening it
>2 new other Legendary Pokemon are called Regilectric and Regidrake
>they are human made golems which were supposed to fight enraged Regirock, Registeel and Regice, instead they turned against humans and Calyrex had to put them all to sleep
>first side story is about catching the Regis, but you can't complete it before catching Calyrex
>second side story can be accessible any time, it revolves around the Gigantamax tree, the big red tree in the middle of the tundra. There are 3 birds - Articuno, Zapdos and Moltres - protecting it. Eternatus energy changed their appearance, but they're not Gigantamax forms

I can't share any more info, so I won't be answering the questions. I hope everything is understandable - English isn't my native language