Do you think John Snow is the promised prince? And is he Eddard’s nephew via his sister and the Taegryn rape, instead of his bastard by a noblewoman?
Sorry to tell you, but he got killed off in Book 5. Maybe he will be resurrected in some way.
I think the theory that Jon Snow is Lyanna Stark’s son from a rape makes the most sense. I think Eddard kept the secret from everyone because he knew if Robert Baratheon found out that Jon was a Targaryen he (Robert) would have him killed.