Not so fast... This thread is for spoilers... not speculation...
I personally am not entirely sure Jon Snow is going to come back.
Here's more GOT spoilers:
Sam gets sent to the Citadel of Oldtown to train as a Maester. He is accompanied by Maester Aemon and Gilly, and a baby. Gilly's baby is secretly swapped with the baby of Mance Rayder and his mistress, to protect Mance's baby from Melissandre's lust for royal blood sacrifices. Maester Aemon dies on the ship ride over.
Theon's uncles are after Dany. Euron has a horn that allows the blower to control dragons, and he sends it with his brother Victarion in his journey to Mereen.
Catelyn Stark is reanimated as a zombie like thing named Lady Stoneheart. She cant talk because of the slit in her throat, and her face has clawmarks from her own hands when she went into madness at the death of Robb. She takes over the Brotherhood Without Banners and embarks on a journey to take revenge. She hangs some Freys and Podrick Payne. She is also about to hang Brienne of Tarth, but Brienne shouts something that makes Lady Stoneheart stop. Apparently Pod survived (I guess they cut him down?) and Brienne reappears luring Jaime Lannister away, stating that she has found Sansa Stark. The theories are that Brienne is leading Jaime Lannister to his own hanging.