Let me preface this by saying I have not read the books but everyone talks about whether Jon Snow will come back...meanwhile I'm over here wondering "Is the Hound dead???"....yes, Arya left him to die but we never saw him die. If the producers wanted the viewers to definitely know he was dead then they would've made it obvious instead of allowing us to assume he died IMO. I have a feeling he'll be back...after all, we've seen numerous GOT characters brought back from the dead via witchcraft/maester.