Since it’s been so long between books, we’ve probably all developed head canon ideas despite our best efforts. I suspect we’ll all be blind-sided in multiple ways during TWOW so let’s break ourselves in softly by calling ourselves out now. We’ve all seen our text evidence for what we think will happen, but over 5000+ pages of books proper plus a lot more material on the side, it’s hard to account for everything especially given that we all have our favorite parts of the series which we focus on
+1 for Jon vs. Dany dancing.
Jon is the Prince who Was Promised ...promised to fuck things up unintentionally.
Dany becomes Azor Ahai, which means pulling a Theon and burning Winterfell.
Jon loses an eye, or both eyes, and gets burned up pretty bad fighting Dany.
In addition to Jon, Dany also tries to kill Gendry - and succeeds.
This in turn causes Arya to assassinate Dany, perhaps wearing Missandei or Jorah's face (just for that Red Wedding style gut-punch).
Sansa