User blog comment:FairyRaven/Fairy Tail Chapter 397: Steel, Review and Commentary/@comment-24784846-20140825132309/@comment-7418318-20140825145759

If there's going to be a tripple feature, I'm think they'd anounce it the previous chapter.

Maybe the chapters have to be handed in two or even three week in advance and we'll see a tripple feature for the upcoming 400 chapter aniversary.