The other reason to post the first few pages: it has the credits for the book's production team, and each one of those people deserve to be recognized for all their amazing work.
These also includes the intro by Miyamoto that Dark Horse has typed up on their blog, and then some of the pages of concept art that Kotaku and Dark Horse already posted. So it's not that I'm really showing anything new, it's that I wanted people to understand how beautifully this is laid out. If you're new here, search the "Hyrule Histora" tag on the right of the blog to find out more about this book.
If you skip a few pages in, the true concept art pages begin: