Meh, they always end as cliffhangers. No surprise there really. And yeah, that's kind of what I think could happen. I'm not saying it will, just that the possibility exists.
Nope. It's common belief that Nick's body got burned up (I've heard it suggested several times before), but I've never really understood where that idea came from (unless someone in the show mentioned that his body was cremated afterwards and I simply didn't hear it). Lucifer simply dispossessed Nick for Sam and left his body lying on the floor of the apartment they were in in Detriot. All Lucifer would have had to have done was reposes the body from the morgue, or wherever it had been buried, or un-cremate the remains and presto- Nick's body is good to go again.
Well, let me be clear, to both yourself and vampman. I'm not suggesting this theory because I "want" Lucifer to come back. Don't get me wrong, I loved Pellegrino's performance too, but I have no over bearing desire to see him returned which is blinding me from other obvious truths (a subtle suggestion which I find to be somewhat hypocritical since "certain people" suggesting it could be accused of the same thing). If I'm wrong, so be it- it won't be the first time and it won't be the last. It just that there is some evidence to suggest Lucifer might be free already:
1- Castiel's statement in the season opener about keeping Michael in Lucifer's cage, but mentioning nothing about Lucifer being kept in the cage as well.
2- (As RC noted in a previous thread) Sam's hallucination of Lucifer actually talked to itself while Sam was out of earshot- something a hallucination shouldn't really do.
3- We know nothing of how soulless Sam was freed from the cage in the first place. Both Cas and Crowley claimed they were responsible, but neither explained how they went about doing so. It isn't out of the realm of possibility that something else went wrong during, or after, his (possibly intentional soulless) release, like Lucifer also getting out.
4- The writers of SPN have proven themselves to be huge fans of misdirection. Having Lucifer actually be real and free, rather than just a hallucination, would pretty much fall into the category of misdirection.
Furthermore, I disagree with this belief that if he were to return he would for some reason have to be the primary antagonist again. Hell, if Chuck truly was God (which I am not at all conceding since it was left wide open to interpretation) then God was simply a side player in seasons 4 and 5. Why couldn't the same be done with Lucifer for a short time?
Haha, now that, I will give you, is a good point.
As for Chuck being God, Kripke confirmed it, the actor who played Chuck confirmed it a bunch of other people who actually work on the showconfirmedit. Can't see needing much more than that.
As for Lucifer returning, if he's not going to be the main bad guy what would be the point? He hates humans, wants them all dead but he comes back and does what exactly? Gets a nice apartment and becomes a deli owner? What? Lucifer is an evil fallen angel with a major hate on for human kind. If he's not trying to kill all of the human race he serves no purpose.
Putting in a twist just for the purpose of throwing in a twist is the very thing ruining movies and tv today and I really don't see them bringing Lucifer back just for kicks.
Ever consider that the things you point out are misdirection to make people think he's coming back when he's not?