The first Season 6 teaser is here!
Doesn’t really show anything new, in that it’s all clips from Seasons 1-5 wrapped up in Bran’s ability to see the past (and presumably the future). Like the poster (below), it certainly implies that Jon Snow is important — and therefore presumably will return in some fashion. The R+L=J theory and the shear number of hints about it in the writing leads me to believe there is no way he’s just plain dead. That would leave too many dangling threads. My money is on the Red Lady bringing him back.