Again, the show goes all out with the Jon Snow is dead party line, which it has been toeing ever since his demise in the Season 5 finale. Yes, Jon Snow is definitely dead, there's no point arguing that. But, well, he won't be staying that way. He was conspicuous by his absence in the new images, being the only major character missing, and now he's in this teaser, saying: "The long night is coming, and the dead come with it." So what does that mean? That the White Walkers are approaching? That we already know. The long night? The dead? Well, reading way too much into things, Jon is dead, and was a member of the Night's Watch, so what this actually means is Jon Snow is coming back, right? That's almost certainly over-analysing, but the point remains: Jon will return in Season 6; methinks Thrones doth protest too much.