I recall that Intuit used to have a dedicated webpage that outlines changes made with each update.

The same is supposed to be available in this "new and improved" community but it appears that only one post has been created so far but solely for Lacerte with the last update and not PTO (which will mirror Lacerte anyway) or PS: https://proconnect.intuit.com/community/lacerte-news-and-updates/discussion/02/202