Hello, writer of the game here.
The new content (the Dragon Isles) is currently being worked on. The dev had to contend with a few irl issues and changes, but he is working away once again. I cannot quite say when the next update will be ready however, as we are once again adding an entirely new area. I do however know that the first (and longest) part of the Isles is already largely done. The rest will be comparably simple to make.