User blog comment:MisterWoodhouse/Blogs are now available on the Unified Community Platform/@comment-26063280-20200824205123/@comment-42177617-20200828061605

They are not migrating away from MediaWiki, they are migrating to MediaWiki. The original Wikia codebase was a highly customized older version of MediaWiki. They are replatforming fandom and gamepedia onto a standard, modern MediaWiki version.