We have an upcoming Edge Router release window scheduled for 9:30 AM (PT) Tue Jan 28, 2020 to 5:00PM (PT) Wed Feb 05, 2020. The releases are rolled out in phases based on regions. This release is not expected to cause any interruption to Apigee Edge.
Once the release window is complete, release notes will be published at: http://apigee.com/docs/release-notes/content/apigee-edge-release-notes
In the event that no functional updates have been made to Apigee Edge, you will not see new release notes.