User blog comment:Rappy 4187/Technical Update: November 18, 2015/@comment-9380534-20151118225134/@comment-126761-20151119135739

index.php type URLs are unaffected - this is about situations where someone types diablo.wikia.com/Penguin, which now gets converted to diablo.wikia.com/wiki/Penguin. Previously this would only occur if 'Penguin' was a real article. (What, no penguins in Diablo? For shame!)