User blog comment:MisterWoodhouse/Fandom is upgrading to a modern version of MediaWiki/@comment-3452092-20190620152911/@comment-1824272-20190620184014

The idea is that, on our end, we will not see major differences on day one. It should be a seamless transition on our side of things. On the backend, it's a massive undertaking, but every feature we have now will likely stick around or even be upgraded.

Links and categories, though, are core MediaWiki functions they would never get rid of.