Their passion will continue to torment Jon and Arya throughout the trilogy, until the secret of Jon’s true parentage is finally revealed in the last book.”
Also, the turning of Tyrion from fan-favorite comic relief to vengeful “Imp” would seem completely out of place at this point.
His passion is, alas, unreciprocated, but no less intense for that, and it will lead to a deadly rivalry between Tyrion and Jon Snow.”
In the show at least, Jon and Tyrion seem to share some sort of bromance, while there hasn’t been the slightest hint that Jon and Arya have any other feelings other than brother and sister.