This isn't the kind of game where you wait for the next release, anticipating what highlights it will contain. Those who have tried this, have all gone mad and only come back here to curse the developer.
This is the kind of game where you ideally enjoy what currently exists, then forget about if for a few years, then replay everything while being glad that there are a couple of new scenes, even if unrelated to the plot thread you wanted to see continued.
Now if you expect to be dying at a random moment in the next few years, you may want to check once a month or so whether a new release has come out (which happens about once per year). Ignore everything what the developer says about what the release will contain (even preview pictures), how big it will be, or when it will come out. Don't get distracted by claims of splitting a release. None of this has anything to do with reality. Just monitor when a new release comes out, then play it. Play it with low expectations unless this forum is excited about the actual content of the actual release.
In short: For this particular game, the developer is just about the least reliable source on release schedules and release contents. Also, the development speed is glacial and the development directions appear to be completely random.
If you ignore the developer and assume nothing in terms of updates, this is a top Ren'Py AVN. If you can't do that, it's one of the worst experiences, but that's entirely your own fault. Don't let the developer spoil your experience.