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, and also there is no need to buy new material to get ready.
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.