It just feels like it was a book made specifically with me in mind. Elementarism has always always been my favorite fantasy archetype. Benders in Avatar, adepts in Golden Sun, the dragoon spirits in legend of dragoon. In superhero games I always gravitate towards options that let me control the elements in some way.
Now here comes this book, bringing my favorite class from first edition into the best game system I've ever played and it's packed to the gills with elemental goodness. Elemental instinct for barbarians, presumably elemental eidolon in the elemental allies section. Archetypes, spells, monsters. Two entire planes worth of elemental goodness, all at a level of quality that I can easily put my trust into paizo to provide.
It's like all my childhood fantasies at the exact same time and I am here for it.
My backup character right now is a playtest kineticist so I can't wait to rebuild him using the finished class!