I've scanned through it. It provides a breakdown of the Darklands region by region, includes the real and visible political powers, has rules for curruption, and also has an overlying narrative structure to it to make it a fun read.
I have only flipped through it still, but from what I've seen and read I am happy to have purchased it. I'm afraid it will be a little later before I can give you a firmer opinion, and also I assume a comparison to the old Darklands d20 suppliment is what you are looking for?