(Spoilers Everything) Hooded Figure in Season 6 Trailer.

In the trailers, there are some clips of this hooded figure. Most people seem to think this is Benjen finally returning, or maybe even Coldhands. I've heard a theory about Coldhands being some sort of sentient warg / wight being, and that got me thinking about Jon Snow. Maybe that's who we see in the trailer. A newly resurrected Jon Snow, goes north to BloodRaven and Bran, saving Meera on the way. And then he actually sees the Tower of Joy "vision". Could be how he learns of his parentage.