I'm also becoming increasingly convinced that Jon dies at the start of the next episode, not Dany.
The entire preview was Dany and Arya focused. Arya is the one who kills Dany. At this point, considering what she's done, there is no way Jon is left alive. It makes no sense for her to massacre an entire town and then not immediately kill the dude with the better claim to the throne than her.
Arya has to be down here for a reason, and she didn't kill Cersei and just spent the episode running around looking scared. The ending of the episode, with her on the clearly symbolic white horse, is setting up something. And Jon has been utterly useless for the larger part of two seasons now.
I think Jon dies, Arya gets her revenge on Dany, and then I dunno what happens to Drogon. Flies away to retire at the Summer Isles maybe.
I dont know if this counts as a spoiler, but Kit Harrington did an interview where he was asked about his final scene, and he basically said It was like having your skin ripped off, and then I had to watch Maisie shoot and it was surreal.
So, that could be nothing, but also
Huh. That would certainly lead credence to my theory then!
Like they can't have Jon kill Dany at this point. There is no way they could write it so it could make sense. And they can't have Dany let Jon live. Again, there is no way that would possibly occur based on last episode.
Arya makes far more sense, and there is a shot with her getting close to Dany's army in the last episode and glaring at (what I assume is her) menacingly. This would make way more sense than what she did in the fight against the Night King. She's trained to be a ninja assassin, and would be the one that can get close to Dany without drawing suspicion. She just needs to take someone's face.
So Arya takes Jon's face, catches Dany off guard cause she already killed him. ---