I got into the CBT, you can see some of the gacha banners in the events tab in the menu. Most of it is the same as recent Mihoyo gachas (HSR/ZZZ), with stuff like discounted beginner banner and standard banner, but there is one new and very important banner: a 100% limited rateup banner that closes once you get the character.
So basically you are guaranteed to get one copy of every character with no 50/50 bullshit unless you go for dupes, assuming they do it for every new character.