This Doffy hint is very interesting - first of all, there is no way we would end up with Yamato and her pilgrimage on the cover - so a cover hint is out of the question.
The first spoilers (true or not) mentioned more reactions from the world - but even if this is what it's about - it's very interesting why him.
If i'm not mistaken, the last time Doffy appeared was in chapter 956 - reacting to information from the newspaper.
I think this gif indicates something more.





