A statement from StarWars.com regarding the author’s compensation:
All participating authors have generously forgone any compensation for their stories. Instead, their proceeds will be donated to First Book — a leading nonprofit that provides new books, learning materials, and other essentials to educators and organizations serving children in need. To further celebrate the launch of this book and both companies’ longstanding relationships with First Book, Penguin Random House has donated $100,000 to First Book, and Disney/Lucasfilm has donated 100,000 children’s books — valued at 1 million dollars — to support First Book and their mission of providing educational resources to children in need. Over the past 16 years, Disney has donated more than 57 million books to First Book.
Star Wars: From a Certain Point of View will be released on Oct 03, 2017 and will be 400 Pages. You can pre-order it here through Penguin Random House.