Larian Studios Forums Baldur's Gate III Baldur's Gate III - General Game Modes

I wouldn't expect there to be more than one game mode and one rule set. Larian never expressed any intent of creating multiple rule sets to my knowledge so barring any kind of official statement from Larian to suggest intent I would also not expect multiple rule sets to be added post launch.

But as always, in DND the Dungeon Master has total control of the game and the rules and is free to change the game as he sees fit.