HAL has announced that the official art book for Kirby Star Allies is launching in Japan on March 16th, 2021. The book, priced at 2,700 yen, includes 200 pages packed with artwork, design documents, and more. A new series of preview pages has been released, and you can check them out here.
Those who pre-order the book have a chance of their copy being signed by HAL staff. As long as you pre-order the book by the end of October 2020, you'll be entered into a lottery system. 40 lucky people will be chosen, and HAL staff will sign the book.