So, something I literally just learned.

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This is a piece of Art that was drawn by Masasi Kishimoto that accompanied the Japanese release of Voruto Volume 1, the collected edition that contained the first three chapters of the Manga as well as the "Gaiden" chapter elaborating on Mitsuki's backstory.

This collected vlume was published back in 2016, that is to say, roughly seven years ago.

Look closely at Sarada. Her eyes, specifically.
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Thesame Mangekyo design that she unlocked in the final chapter of Boruto Part 1.

So... Sarada's Mangekyo was designed seven years in advance, at least...

What else was planned out that far ahead?