I'm wondering if there are any significant improvements coming in the next +/- 18 months for multimedia search on Commons. Finding images can be a very time-consuming job for Wikimedians and other users of the site.

For example, it would be nice to be able to do a "join" search with categories, so that only media files that appear in 2+ selected categories are shown in search results.

As an example, suppose that I want an image of a blue tile roof in China. The search "blue tile roof China" doesn't show any results that interest me on the first page. However, https://commons.wikimedia.org/wiki/File:Wuhan_University_-_roof_tiles.JPG is an image that would interest me. That file is several layers deep in subcategories under the China category. It would be nice to be able to find that image by searching a join of the China category and its subcategories, with the "blue roof" category.

Thanks,