Take time to check out the document that indicates the edits that were made.
To get access to the Practice Advisories - which are the bulk of the red book - you have to be a member of the IIA or buy the book from their bookstore. The standards are short and have always been available to the public.
I am creating a course contrasting the yellow book and the red book for Sandia Labs over the next few days and will give you a heads up on what the big changes are soon. Yes, some shops are orange.