OpenAI is continuously improving its models and capabilities, and incorporating retrieval-augmented generation (RAG) techniques is part of that ongoing development. While specific timelines and implementation details for features like employing prior chats in RAG are not typically disclosed, it is reasonable to expect advancements in this area as OpenAI enhances its tools and models to provide more context-aware and personalised responses. If you have specific needs or timelines in mind, it might be helpful to keep an eye on official OpenAI announcements and updates.