According to Arvus's "Planned Features and Content" post: "Roundscape Eclipse is our main project, but every month we're not releasing a Roundscape Eclipse Patch, we'll be releasing some Starmaker Story Content in return." I've also heard it said in the forums somewhere that Arvus releases a new game on the last Sunday of the month, which roughly lines up with Arvus's release schedule. That being said, the updates have been slightly later than planned recently (totally understandable, game design is hard and these updates are free).
Arvus last posted an update to Starmaker Story on October 5th (That was the update for September). Then, they updated Roundscape Eclipse on October 28th (The update for October). Now, we are waiting on an update for November. I don't know if an update has been posted elsewhere and I haven't seen it or if Arvus is running behind schedule, but an update should be coming soon unless Arvus says otherwise.