If by the next chapter you mean, chapter 19 (which would continue the main story), it will take a while. Keep in mind that 0.5 pushed the story forward into its last third, so we have to begin planning how we're going to wrap up the game now, and we want to take our time to do it. Chapter 19, specifically, has some very complicated scenes writing-wise that deal with the fallout of chapter 18- Pedro or Nikos either taking up a position in the staff or leaving the hotel, depending on your choices; what does Oscar want to do with his life now, and how he relates to Asterion; how Asterion and the player advance their relationship; and we have to introduce the conflict to drive the last chunk of the game. It's a lot.
Which is why we decided to focus on optional content for now. It's way easier to write, it gives overlooked characters a moment to shine, it gives us time to recharge our batteries after the herculean task that was delivering a whole third of the game in one build, and carefully plan the rest of the game.
So, yeah, we'll get to chapter 19 when we're ready. I completely understand that we're giving people massive blue balls with this delay and I'm sorry about that.
We used this long hiatus between builds to get a lot of work done on the other characters' content ahead of time, though, so we can guarantee there will be more frequent updates until we get to 0.7 and that will make the wait more bearable.