They're currently working on vastly improving the existing aspects of the game and adding new features, so the game is nowhere near done.
Any new content will most likely come with the Definitive Edition, kinda like DOS2 received a few quests and gameplay features in the form of Gift Bags.
Tinfoil hat theory.
NO one from Larian comfirmed this. It's purely fan speculation based on the previous 2 (just divinity 1-2)games. I can't even say that this is applying to all of the products of Larian.
I am not saying that your wish can't be true. But definitely you will be disappointed if this will not happen at all.
