As you know, I have been eagerly awaiting the book. I have poured over the playtest material, ran one playtest group, and played in another group (briefly). After all of this, I was actually prepared to be let down with the actual book. My fear was that the book would include little new material (except gorgeous art).
I was totally wrong. There is a great deal of new material, the material from the playtest is tighter and more compelling, and I am thrilled by final product.
I am still working through the setting material (I have to also prep for running Strange games at Gencon), but I love what I have seen so far.