Tharvot
Crusader for Truthiness
My prediction is that after he wargs into his wolf. Mel does some stuff with his corpse and puts it in the cells at the wall, rather than let them burn him.
After the White Walkers attack, Jon's body reanimates, and now that Jon knows he can do it, he forces himself back into his own corpse, takes control.
Now he's got his own consciousness in an amped up body. Doesn't feel pain, or cold. Doesn't need to eat. Extra strong. Whose side he chooses to be on at that point, is up in the air.
I think he ends up in direct opposition to Danerys.
I never liked the "jon wargs temporarily" theory. I much prefer that he survives the attack outright. Maybe the wildlings find his near corpse body in the snow and treat his wounds until he regains consciousness. Or I prefer Mel giving him the kiss of life. I actually even like the idea that The Night's King raises his corpse.
I basically like everything BESIDES the warg thing haha. And with the show all but eliminating Jon and Ghost's connection completely, its hard to imagine they will just be like "oh, remember this thing Bran can do, well Jon can do it too even though we never even hinted at it!"