Dead is dead. And Jon Snow is definitely dead. That's it, he's gone and he ain't coming back and oh wait, there he is! The trailer doubled-down on the idea of Ned's bastard being a goner, with multiple shots of his corpse, but they're fooling no one. Then, in amongst all the chaos, there appears a man on horseback looking a lot like Jon Snow. Is it definitely him? That's hard to say, but it's certainly plausible. Even if it's not him, the more the show tries to convince us that Jon is indeed dead, the less believable it gets, and the shots of him being dead in this trailer only serve to reinforce the idea that he'll be coming back, because otherwise we wouldn't need to see so much of his dead body.