Board Thread:Character Discussion/@comment-27189580-20151203140302/@comment-24674051-20151203175317

Well, given that "Bloody Hell" is Killian's goto phrase (such as when he saw the portal open and Charon's boat appear with the Dark Ones), it's possible that we will see that either in the cliff hanger, or when we see the beginning of the Spring arc. (Why are we all jumping to the conclusion that Killian is going to die? I could make a case that Rumple might be the one to die, or Emma, or Regina, or anyone else. Or, EVERYONE else for that matter)

As for seeing Hades in some way, They could make that happen. The Actor that is (presumabably) playing Hades was cast early enough to be present for the filming of any scenes that appear in the Finale. He does not appear in the Press release (but then again, there are others known to appear in the episode that are not listed in the Press Release). However, that may also depend if whether they intend to have Hades be a major or minor character (from the story perspective)