From the ISC2 website: Beginning in April 2018, the CISSP® exam will make use of a new exam CBK. See below a review of what is new in the revised CBK (almost nothing) and how it will not affect your learning, the resources you use.

Finally, more than a year after the latest CBK has been released, ISC2 has finally updated their study book.

I have asked this question on the ISC2 community website. See the response I have received within this article. I have reformatted the article for the look but it is the verbatim response that I have received from ISC2.