Can we please get a page with a changelog/release ntoes that lists all changes in each Wikibase version similar to how it exists for Mediawiki (https://www.mediawiki.org/wiki/Release_notes)?
Topic on Talk:Wikibase
These are provided in git by the development team: RELEASE-NOTES-1.37, RELEASE-NOTES-1.38, RELEASE-NOTES-1.39 etc. Is that sufficient for your needs? I don't think copying them onto the wiki would be a good idea, as they would diverge from reality pretty easily (as do the MediaWiki notes).