Turns out I pre-ordered from Awesome Books, not Amazon. It's showing as in stock on their site but I've not heard anything so I emailed them to complain yesterday. They said they'd look into it and get back to me but I just received a shipping notification from Hermes that I'm guessing is this book.
My copy just arrived. It's wound up being an early birthday present to myself
Only had a very cursory flick through it so far but suffice to say it looks amazing, and a considerable step up on the last art book. Really wide array of art styles - from cartoons to photo-realistic, funny to genuinely horrific. Some truly magnificent pieces in there. Especially liking some of the alternative movie poster ideas.
Recommend it big time.