Yesterday, the Path of Radiance art book Tellius Recollection (Part 1) was released in Japan. On the same day, Amazon Japan opened up pre-orders for Tellius Recollection (Part 2), which covers the sequel, Radiant Dawn.
At the moment, there are very few details about the Radiant Dawn book, except that it’s scheduled for release on 28th October 2016 and will retail for 3,456 Yen just like the first book.
As for the first book, Japanese fans have only just started digging in and our own copies haven’t arrived yet, so it’ll probably take a while before all the juicy details start flooding in.
For now, here’s a basic description of the contents of the book according to an Amazon review: