I've read about how they're trying to develop it for a third season, but there probably won't be much movement on it based on so much shakeout from streaming services.

As you can imagine, creating a period piece that uses such specific medical equipment and set dressing is extremely expensive to make. Adding to this problem, the showrunners are currently attached to ANOTHER period specific series, Perry Mason. I liked that show, but I also know that it's going to take a lot of effort to keep that production afloat at HBO. It doesn't leave much time for the showrunners of The Knick to boost interest and raise money for the backburner project.

I'd love to see it though.