They could do a whole season as if it were an ordinary season and then only do the reveal in the season finale. That would sure stir up the fangirls!
The other theme of S4 should be Sam struggling with good and evil in his own abilities. I'd also like to see Sam and/or Dean finding out exactly what the history behind the demon and their mother is, although I get the sense they're going to drag that out until the show ends to give it a sense that they're pulling a common thread through the whole thing.
Well, if demons were originally human (if we assume that wasn't a lie), then demon souls are in their essence the same stuff as human souls, so you're probably right that something that kills demon souls will also kill human souls. On the subject of grace: I totally want you to read Lyda Morehouse's series because I don't want to spoil you for it with what I want to say. Alternatively, have you ever read James Morrow's Only Begotten Daughter? In it, everyone is in hell (I think it's the idea that if some group thinks you're going to hell then you are, and since pretty much every group thinks every group that's not them is going to hell, then everyone ends up there). Jesus is the only person who can get into heaven, but he's Jesus so instead of chillin' in heaven, he's in hell trying to provide comfort to the souls there (although since it's hell, he can't provide them with any real comfort, just doles out endless dippers of water).
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The other theme of S4 should be Sam struggling with good and evil in his own abilities. I'd also like to see Sam and/or Dean finding out exactly what the history behind the demon and their mother is, although I get the sense they're going to drag that out until the show ends to give it a sense that they're pulling a common thread through the whole thing.
Well, if demons were originally human (if we assume that wasn't a lie), then demon souls are in their essence the same stuff as human souls, so you're probably right that something that kills demon souls will also kill human souls. On the subject of grace: I totally want you to read Lyda Morehouse's series because I don't want to spoil you for it with what I want to say. Alternatively, have you ever read James Morrow's Only Begotten Daughter? In it, everyone is in hell (I think it's the idea that if some group thinks you're going to hell then you are, and since pretty much every group thinks every group that's not them is going to hell, then everyone ends up there). Jesus is the only person who can get into heaven, but he's Jesus so instead of chillin' in heaven, he's in hell trying to provide comfort to the souls there (although since it's hell, he can't provide them with any real comfort, just doles out endless dippers of water).