If there was a limited edition artbook for for AC Black Flag surely we would have seen or heard something by now.
Heres another book i havent seen mentioned here yet. They seem to be going into overdrive in the book department this time.
AC IV Black Flag Blackbeard: The Captains Log-seems another artsy type book with info
http://www.fishpond.com.au/Books/Ass.../9781608873227