The unreleased and upcoming encylopaedia Zelda, The Legend of Zelda: Hyrule Historia, has already taken the top spot on the Amazon book listing with two days of it being available for pre-purchase. The book on the top spot of this chart before that was the erotic literature fanfiction novel:
Master of the Universe50 Shades of Gray, which has been available for 105 days.
This just goes to show the amount of buying power that the fanbase behind the Zelda series has. I know that us here at Capsule Computers will probably be buying a copy each at some point and you should all check out the Amazon top 100 ranking to see for yourself.