When the Media Viewer is enabled, if a Wikipedia user clicks on a file image, the information shown is summarized from Commons. Though not all Commons images have Wikidata items and this will probably never happen, many images of artworks such as paintings and sculptures have very detailed items on Wikidata that can be offered to the user in his/her native language. For images that are linked with Wikidata items, the user should be offered the "Metadata" button with the WIkidata logo in addition to the "More details" button with Commons logo. If this is enabled, it should also become easier to add a wikidata item number to all images in a Commons category (e.g. artworks have detail images etc) so that whichever file is viewed on Wikipedia, the media viewer will be able to pick up the correct wikidata item for that image even though it is not the "lead image" on Wikidata for that item.
--Jane023 (talk) 12:51, 19 November 2015 (UTC)
This card tracks a proposal from the 2015 Community Wishlist Survey: https://meta.wikimedia.org/wiki/2015_Community_Wishlist_Survey
This proposal received 14 support votes, and was ranked #55 out of 107 proposals. https://meta.wikimedia.org/wiki/2015_Community_Wishlist_Survey/Wikidata#Modify_Media_Viewer_to_include_Wikidata_information