I think they still have something like at least 3 more major builds/feature goals currently planned. One is actual human NPCs, which the animal AI is a beginning step towards. They also want to do a lot more psuedo-random storytelling with houses and NPCs. They already have some, but they want to expand it quite a lot.

They've said that the "official release" will only be when they've added everything they want out of the game, so don't wait to buy it as it is absolutely a complete game as is. Could be another decade before they're done, lol. They just want to add so much more that they aren't comfortable calling it done yet.