A limited edition colour art book will be bundled together with volume 50. It will contain 64 colour pages that have been published in magazines before. The volume 50 + colour art book bundle is currently on pre-order for 924 yen. Once it has sold out, it will have sold out for good and don't count on VIZ ever bringing it over. The pre-orders will ship out on March 28th, so if you want it, you should pre-order it before that.
You can get it from CD JAPAN (
http://www.cdjapan.co.jp/detailview.html?KEY=NEOBK-1624595) or from
Amazon.co.jp (
http://www.amazon.co.jp/gp/switch-language/product/409159185X/ref=dp_change_lang/377-2324399-9164836?ie=UTF8&language=en_JP) (using this guide:
http://cdn.halcyonrealms.com/japan/how-to-order-from-amazon-japan-a-detailed-buying-guide/).
Note that it ships from Japan, so shipping is a bit pricey. However, I think it's worth it since it's a limited edition of colour awesomeness.
