This is a long-overdue release that updates Cascade to the version that corresponds to the Summer 2022 release of ArcGIS Online. Most importantly, it updates Cascade's Identity Management to be in line with current ArcGIS Online and Enterprise systems. Versions before this might not authenticate correctly, and some content will not load.
Note that, as of Fall 2021, Cascade is in "Extended Support" in ArcGIS Online and "Mature Support" in Enterprise. Thus we would suggest that users look toward creating new stories in ArcGIS StoryMaps.