I've had a chance to form a first impression; picked it up at the FLGS on the way home today. I did have it on reserve (after getting and reading the Conan core book, I let them know I wanted the next few releases, at least).
Overall, it's a nice book. Slim, full color - same layout as the corebook as was previously mentioned. Seems to stay on target: sorcerers and sorcery. I liked the chapter dedicated to Sorcerous Culture (religions and secret societies), and there's a handful of pages adding to the core book GM advice with respect to sorcery.
As a 1st impression, I'd probably go with 4 out of 5.