Since the last update was road map #3 on Dogathan Productions Patreon page (haven't read it) so if I had to take a guess he wont really start working on v06 until after the new year.
Well deserved tbh. As somebody who has been following this since the first version the last update was one of the most satisfying updates for a VN style game I've played in a long while. Not just a few lines and a CG and done with.