From what you've shared, this doesn't sound all that... interesting. It seems as if the authors, judging from what you wrote, took a number of huge steps backwards.
I wonder if it's against the rules for some of the freelance writers not to take the time to do some research on the material from previous editions. Although there are plenty of things I despise with FCI, it was a great book because the authors took the time to do research on the material that preceded their material while adding new concepts... even if they end up contradicting or sidelining earlier ideas. This does not, based upon what we're seeing here, appear to be the case and that's very troublesome.
I like the idea that DMs can go in and make some adjustments to published material; however, I also think it's important for the designers to pay attention to work that preceded them and ultimately allowed them to write the stuff they end up with. Now, if there's more to all of this than meets the eye when I get the book, perhaps I'll be pleasantly surprised, but so far it looks like I'm going to be disappointed.