Here's another article about the book that Frederik, Victoria, and Haakon plan to write:
Billed-Bladet - Frederik skriver bog sammen med Victoria og Haakon
Each royal will write a chapter describing their thoughts and experiences during their expedition this year, and the expedition before. There will also be contributions from three different environmentalists. The book will go on sale next fall in Denmark, Sweden, and Norway. The release of the book will happen simultaneously in the three nations.