There is a first wiki:
https://solasta2.wiki.fextralife.com/Solasta+2+WikiI watched various YouTube videos of this game and it looks really extremely like BG3.
Its about four (you can choose to make less but there is no point) siblings from a foster family and you can get various other permanent or temporary companions, apparently up to a group size of 8 ?
You cant do much with the later, except for giving them commands during combat. You cannot change their equipment or see their inventory or level them up. Thats only possible with the self created characters.
Anyway there is no main character and thus for example also no romances.
I'm not 100% sure but it seems all subclasses are homebrewn, and this is by design, the standard subclasses wont be implemented.
The four self created characters can pick from one of eight "personalities". You probably should make sure to make every one have a different personality. Personalities get dialogue options. In a conversation any of the siblings can give the next answer, so having duplicate personalities would limit available dialogue options. If you make everyone with the same personality, thats allowed, but you may only get a single answer option during conversations.
There is also something else for which I havent found a name, which relates to the personalities. For example you can be personality Jester or Outlaw and the other role is then you being the black sheep of the family.t
Backgrounds are back and even worse than before. Originally they served the purpose that you would think better about what drives your character. Now they limit what you can do with the character. On the plus side you get a feat from them.
At least for the moment you have four voices. So you are forced to make two siblings male and two female, if you want to have different voices.
Character graphics are pretty awful, worse than BG3. There is basically a really ugly female body thats supposed to be the male body, and a very flatchested female body. There is also a problem with making an actually male looking face. Its possible but not easy.
Designing the face is more variable than in BG3. For example you can freely place scars somewhere on the face. You can also mix up to three faces to get something in between. Not that thats too useful since there arent many differences between the faces.
All in all I'm rather lukewarm on this. This seems to be to BG3 what Icewind Dale 1+2 was to BG1+2.