Not sure it's been mentioned, but words been out since June that Kit Harrington is spearheading a GOT sequel spinoff based around Jon Snow. He came up with an idea and discussed it with George, and has brought in his own writers and people for it allegedly. Sounds like it's in the works, although not yet officially announced by HBO.
With these scenes describing the prince that was promised/song of ice and fire (Jon) in this show, you wonder of some of that is setting the stage for that series and Snow's eventual fate. Since Arya was the one that vanquished the white walkers, you wonder if there's another northern/winter threat meant for Jon to fulfill that prophecy/dream.
Maybe Johnny is coming for his throne after all (and to right some of the wrongs of S8).
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