A while back one of their reps did say somewhere on Reddit that they have no intention of adding any LLM features to Scrivener. Granted, they said that in the context of moving towards a subscription model and talking about features that don't work with their current business model, but still. Unless something has changed recently, they seem to want to stick to being a one-time purchase without any cloud-based services whatsoever, including AI, for their next major version too.