I decided against backing this because I figured there would be a strong "winging it" element and a little bit or a whole lot of re-tread of the multiple monster books FGG has done for S&W/PF and even Necromancer proper back into 3.x.
This preview makes me feel OK with that decision, as I find I rarely use more than 1/4 of the monsters in any supplemental bestiary (i.e, not the MM), regardless of edition. I would love to have the adventure book, but I am not willing to gamble the extra $ for the monster book. in order to get the former.
Had they waited until January or something, to get a good grasp on the finalized rules, I probably would feel differently.