Kay, chatted with product management on this one, here's what I found:
Right now everything is manual, but you can at least see the changes in the Publishing tab
Early 2019 you'll be able to click a link to copy the settings from an earlier revision into a new library
Later on in 2019 you'll be able to quickly revert to a prior build and publish that without affecting the current library (useful in instances where something catastrophically broke and you need to quickly switch back to an earlier revision).
Kay, chatted with product management on this one, here's what I found:
Right now everything is manual, but you can at least see the changes in the Publishing tab
Early 2019 you'll be able to click a link to copy the settings from an earlier revision into a new library
Later on in 2019 you'll be able to quickly revert to a prior build and publish that without affecting the current library (useful in instances where something catastrophically broke and you need to quickly switch back to an earlier revision).