Should you get the new CISSP books or stick with the old ones?
You can do both!
The new April CISSP CBK domains have not changed that much at all except the addition of a few new topics.
Check out this article for more information:
But if you want to fully perform your due diligence and would rather get the newer editions of the current CISSP books, below is a breakdown of when they are available.
CISSP All-in-One Exam Guide, Eighth Edition
Release Date: October 22, 2018
CISSP Practice Exams, Fifth Edition
Release Date: October 22, 2018
Sybex 8th Edition
Kindle Version: Available now!
Book Release Date: May 8, 2018
Sybex Practice Tests 2nd Edition
Release Date: June 13, 2018
Official (ISC)2 Guide to the CISSP CBK
Release Date: TBD