History/Notes of RedShift Versions

You can find the notes from the documentation directly on the AWS website, in the white papers:

https://docs.aws.amazon.com/redshift/latest/mgmt/cluster-versions.html

Also there are announcements that do show up as well:

https://repost.aws/questions/QUJZGVp-dkRpysMrVZ7uX_tA/announcement-amazon-redshift-maintenance-january-19th-2022-march-25th-2022