The d20 version done by Necromancer and JG was built off of the original products of Guide to the City State of the Invincible Overlord and Wraith Overlord. It was a huge collaboration effort between a lot of different parties, which is why this stuff is not feasibly usable.
As for what the PF products will be, this is from the Book Section on the Kickstarter:
"...this version of the City State [is] a compilation of 4 of our past products! This version of the City State of the Invincible Overlord is going to include expanded content. We've used the original City State of the Invincible Overlord, Wraith Overlord, Thunderhold, and Modron as a framework. Then we've expanded on that framework in a way that does not take away from that original Judges Guild sandbox feel. It has really helped fill the gaps to make the presentation and flow of the product more natural."