Board Thread:General Discussion/@comment-1916997-20151012011036/@comment-1894786-20151015014051

Eskaver wrote: (Remember no spoils) That's hardly a spoiler. It's an announcement by the creators. It's no different than pre-release announcements for a video game.

An example of a spoiler would be "Emma kills Henry in the final scene of the winter finale". (That's not a real spoiler, it's just an example.) Saying "We'll see a Hook/Regina adventure coming up this season." is an announcement and teaser.