I see that Wikibase Client has been enabled at Meta in T108825, but that only seems to cover linking pages to entities. Wikibase Client’s [[https://www.mediawiki.org/wiki/Extension:Wikibase_Client/Lua|Lua interface]] is not enabled, so Scribunto modules are unable to retrieve entity objects.
[[https://meta.wikimedia.org/wiki/Module:Project_portal|Module:Project portal]] currently auto-generates source code for all the multilingual www.*.org portals other than www.wikisource.org. It would have several uses for Wikidata:
* For the www.wikibooks.org portal, it should be able to automatically detect the “write a new article” help page for each wiki. Instead, I have to hard-code that information in [[https://meta.wikimedia.org/wiki/Module:Project_portal/wikis|Module:Project portal/wikis]].
* The various Wiktionaries have a total of four logo designs among them. Module:Project portal/wikis similarly maps each wiki to its logo design. It would be better to glan this information from Wikidata statements.
* There’s a function that translates [[https://meta.wikimedia.org/wiki/List_of_Wikipedias/Table|List of Wikipedias/Table]] on the fly. It should be possible to insert sitelinks to each language’s article on a given Wikipedia. (`#language:` isn’t great because it relies in large part on CLDR, which often differs from Wikimedia’s own names for languages.)
There are a number of other pieces of functionality around Meta that would benefit from `mw.wikibase.getEntity()`.