That area was made a few updates ago for the first guest-writer who wanted to contribute to the game. His progress went steady for some time, but he eventually got burnt out. He is planning on working on it again, but I cannot give an ETA as it entirely depends on the guest-writer's work.
Admittedly, I shouldn't have that area be accessible, as there is no guarantee he will finish his work. I'm sorry if I got your hopes up!