I have this horrible, soul destroying feeling. That Cersei will choose the mountain (obviously) and the High Sparrow will summon a healed Hound. Given the amount of characters returning from the dead recently it wouldn't shock me one bit. Sigh.
The Seven are not in the business of resurrecting people though. And it will be completely illogical - and Game of Thrones writing, as bad as it is sometimes, always has logic and hidden clues in the previous narrative. Nothing connects the Hound and the High Sparrow afaic and he (the Hound) was pretty much against any religion at the point where we left him, without any signs of change.