There is a new Avatar book coming called The World of Avatar: A Visual Celebration, it is set to be released on October 1st of this year. The title may be a bit confusing as we already have the theme park Pandora-The World of Avatar, but this is totally separate from that. Here is a description of the book from the publisher Penguin Random House.
It looks pretty cool to me, and I love Avatar books, so I am very excited to pick this us. You can pre-order it now from Amazon for $19.99 at the link below.