User blog comment:Trellar/Introducing Wikia's New Homepage and Logo/@comment-1025281-20120406085737/@comment-8-20120406164245

We're going to do a mass update of the default W favicon soon. We're doing it via the backend, which should mean we can catch all of them without affecting any custom favicons on various wikis. Of course, with the way browsers cache favicons, it's likely to be a while before you see the change - even once we've got 'em all.