okay so I think everyone has been noticing Kishimoto shows signs in manga for us to kinda put the pieces of the puzzle together and predict what might happen later in the series.
I saw some signs in the OVA clip but that is not Manga, but i will count video clips that you guys have if you see some signs.
also the post "old chapters where kishi kind of tells us the future"
by Hidden sage, he found some regarding the front page of all the manga chapters.
the front page of each chapter you will find most of your clues at.
I'm going to start looking for some now
All of you Please post here what signs you are seeing