Board Thread:Theories and Speculation/@comment-32457608-20170823143115/@comment-5085906-20170825135419

Everything that was even mildly foreshadowed in Part I was eventually resolved in Part II. We saw Mangekyo Sharingan as early as Part I, but we were introduced to the concept of a Mangekyo Sharingan during the Itachi pursuit mission. Same thing goes with the Uzumaki clan. We saw Madara's statue in Part I, then we got to see Madara and the story behind the Valley of the End in Part II. We saw Team Minato in Part I, then we got to revisit them in detail in Part II.

So if Sakura's "clan" symbol was supposed to be foreshadowing, we would have gotten an answer to it by Part II. But now the manga's over and Kishimoto has expressed desire to create another manga that has nothing to do with Naruto. Whatever arc that Sakura may have been slated to follow, it has long been aborted.