I'm curious if Jon is really dead. Some theories of him coming back are, he lives on as ghost, he is resurrected by Melisandre, he is Targaryan so he is brought back to life via the flames when they attempt to burn his body, or he turns into a white walker.
With Kit Harrington not being back next season on the show I think him living on as Ghost is the most likely.
After reading the 5th book I thought there was a chance that the stabs didn't kill Jon, but the show made it a lot less ambiguous.
I'm not sure what happens with Stannis in the book, since I'm pretty sure Lady Stoneheart stops Breinne and she won't be at that battle. I wouldn't be surprised if she decided not to kill him on the show too.
As a book reader, i'm really hoping that Martin gets his stuff together so that the book can come out before the next season of the show. If the show comes out first I will know what happens for most of the characters (minus a few changes) and it will be significantly less enjoyable.