There's a few things so far I'm not content with (some of the organization changes, mostly, and a few minor typos), but so far, I think this book is very well done!!
Some of the things I like so far:
- Salamanders are now focused on "fire as art", and their evil comes from their lack of regard for the damage they do, as opposed to the slavery thing.
- There's stat blocks for swarms of dretches, larvae, and lemures, allowing for them to be used more often!
- New monsters like the Elemental Cataclysm, and the animal lords!
- The lil tables of ideas that a lot of the entries have are nice! As a DM, I love idea starters like that.