Here's a couple of things to know.
1. Divinity Original Sin 2 required nothing from the first game to play and no Larian game will require knowledge of previous game to play, probably ever
2. Larian has put out the same kind of game on a very similar engine with the same bugs and shit similar to Bethesda and TES or Fallout, or similar to Fromsoft, so they are probably just talking about lore here or ruleset which may change. I expect Divinity to be another Larian game not some new genre. So it will be like DoS2 and BG3 with different ruleset probably, book it.
3. If you have played BG3 you have played DoS2. These are very similar. BG3 is more similar to DOS2 than TotK is to BotW. BG3 is much more similar to DOS2 than Elden Ring was to Dark Souls 3. BG3 and DOS2 are the same game with different story scenarios, characters, and rulesets, but the same logic runs the game. BG3 is an iteration on DOS2, not a from scratch new game. Similar to the copy/replace joke that Bloodborne is just Darksouls 3 with copy/replace changing the word souls to the word blood. That is how Larian games are and I'm not diminishing them here. I'm saying they are as good as Fromsoft, Nintendo, and Bethesda at the very least, and like those companies they know iteration is the path to perfection, and that variety for variety's sake isn't playing to the strengths of their company. Larian is world class at what they do but they are not world class at everything. They should and will stick to what they know best.
4. Act 3 of the new game will be rushed at launch and not as good as act 1 or 2, that is how they launch their games
That's it. It won't change because you like them now. The next Larian game is probably the same game. That is the only reason I'm hyped. If they were trying to do something different I'd be bummed. Larian is a GREAT studio but they cannot make the Witcher 4. They are best at making games like DoS2 and that is what will make them money and keep them successful. That is what they will continue to do. They will not go chasing a passion project and put the studio at risk.