Essentially this would just be a couple of custom queries over phabricator data with a custom display format to show a unified view of the state of wikimedia release branches, extensions deployed, the current release version for each wiki/project, etc.
Having all of this information in one place with minimal unrelated noise will make it much easier for anyone to determine what code is deployed, and when a given piece of code can be expected to be deployed.
This could incorporate a summary of upcoming SWAT deployments as well