ArcGIS Living Atlas is continually updating... improving... adding new content, apps, and more. Keeping up to date with what's going on can be a challenge, but this latest ArcGIS Living Atlas News (November 2020) delivers the latest summary.
ArcGIS Living Atlas is also summarized in each ArcGIS Online What's New blog article, which delivers with every release. The Living Atlas section can viewed there, and a direct link is now available. Here's the Living Atlas summary for September in the ArcGIS Online release blog article.
One of the key improvements is to the World Imagery Wayback app. The app now has a swipe mode which makes it easier than every before to compare imagery from the Wayback archives, and also to share a URL that enables others to view change over time. Here's @RobertWaterman blog article encouraging you to Do the Wayback swipe.