In previous versions of Tor Browser, before the most recent update to about:home, there was a link to release notes in the upper-right corner of about:home. Now, the link to the current version’s release notes is only shown once after you update Tor Browser to a new version. If you refresh the page, the release notes link does not appear again.
I would like to suggest, maybe as an optional setting, that the release notes link be available there beyond just the first time about:home is loaded since I often want to read the release notes at a later time.
If there is a design-related reason not to keep them at about:home, please consider adding a link to the About Tor Browser page.