I've been reading the early access version for a while now, and it is excellent. I hadn't had much luck with the "official" documentation, previously.
Jim Blandy's writing is an exemplar for good teaching technique, and this book is shaping up to be the go-to recommendation for learning Rust, in my opinion.
I have been reading it as well. For my taste, it is a bit too verbose.
I like to see something along the lines of the K&R book or the GoPL book. I was hoping that "Programming Rust" is such a book, but I was disappointed. And (may be it is just me) I like to see exercises in Programming books.
C an Go are pretty concise languages so they lend themselves to K&R and GoPL. Rust is a big language (like C++) and is still changing quite a bit so I don't think you'll get a similar tome in the near future. (imo)
Jim Blandy's writing is an exemplar for good teaching technique, and this book is shaping up to be the go-to recommendation for learning Rust, in my opinion.