The row of sitelinks at the bottom of listings that appear for generic queries has returned. Gary Illyes's comments seem to imply that their removal was a bug. Just to be clear, this isn't the huge branded display of sitelinks that appears in two columns below big branded queries - it's just the single line of quick links that appeared for some listings in generic queries. You can read more, and see some examples, in this story from The SEM Post.