@eric Regarding the sitemap, we’re checking in with our developer who manages the Pressbooks infrastructure, but as Liz mentioned, it should display books as they are “published.”
There should also be a way to tell if a book is ready for distribution, and an intelligent way to signal versions and revisions. We’re working on this with Pressbooks!
Rebus is involved with the W3C publishing working group - you can find out more about it here: https://www.w3.org/TR/pwp/. The OpenStax revisions process have been discussed in some of previous Office Hours sessions, you can take a look here: https://about.rebus.community/2017/08/july-office-hours-recap-video-updating-open-textbooks/