Does anyone else think maybe the Hound will be killed and they end up bringing HIM back as the dead wight and then the big surprise is that it’s not just CleganeBowl we get, but CleganeBowl 2.0: Undead Edition??

You're correct. His wound was infected, Dany asked the witch to heal it, she used magic to turn him catatonic. Then Dany smothered him with a pillow to finish him off. There was NO POISON. Why is everyone obsessed with that idea?