Update: English edition of the book exists.

Here's a preview look at the English edition of the Japanese art book Monster Hunter Illustrations (モンスターハンターイラストレーションズ).

Images and book description are from Udon:

Beloved by fans the world over, the Monster Hunter series takes players on an epic quest to hunt the most dangerous and fantastic monsters imaginable. Monster Hunter Illustrations collects the unparalleled artwork behind this landmark series. Inside you’ll find over 300 pages of designs for characters, monsters, armor, weapons, and more, plus tons of rough drawings, sketch work, and creator commentary.

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Here are direct links to the book:
Amazon.com | Amazon.ca | Amazon.co.uk | Amazon.de | Amazon.fr | Amazon.it | Amazon.es | Amazon.co.jp | Amazon.cn