Illusionsoft shut down back in August 2023. Some of its members opened/joined a new studio called Illgames, and it looks like they'll be releasing
similar games to the previous company's lineup.
As to your question regarding the implementation of IA or AI, I've seen no such news coming out from Illgames. All signs are pointing towards similar systems to HS2 and their old releases, where all interactions and personalities are either selected or formed based on player choice and other switches and variables. But who knows what the future holds, IA/AI is getting better everyday, as they say.