Castiel has a deal with the Empty, and the Empty (in the form of Meg) acknowledged that. (The angel offered himself up to the Empty in exchange for Jack.) But the Empty could torture Castiel (and did) even though they’re both on the same side in the fight against God. There’s no way that loose end won’t be addressed before the end of the series.
Jack has his soul again
After they found the Occultum — part of Billie’s spiritual quest for Jack — the instructions indicated it had to be in Jack. So, he swallowed it and was transported to the Garden of Eden. “Who are you really?” a snake hissed at him. “Who are you meant to be?” When he returned, his soul was back. “I’m so sorry,” he told Sam and Dean and sought their forgiveness for killing their mother.
Castiel made a deal with Ruby
In exchange for the location of the Occultum, Castiel agreed to try to get Ruby out of the Empty. Considering it took a decade to see the demon again — Genevieve Padalecki returned as a fictionalized version of herself in the meta “The French Mistake” — that doesn’t necessarily mean that we’ll see her again. But that deal could come up again, even if just as part of what’s still to come between Castiel and the Empty.
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The team-up to kill God
Billie recruited Jack to kill God, beginning with strengthening his body before the others were brought in. Now, Sam, Dean, and Castiel are part of that ongoing quest.
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Amara may be on the chopping block, too
Dean pointed out that even if Jack kills God, that still leaves his sister. If Amara’s still alive, “that throws things out of balance,” which means the world ends, he told Sam. So taking out both siblings is a real possibility.
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Someone would have to take over
If both God and Amara are out of the picture, who’s going to be in charge? That was left up in the air in “Destiny’s Child.” All Sam and Dean could agree was that it should “probably not” be Jack, considering he walked in at the time to show off that he just learned how to blow a bubble with gum.
Alternate Sam and Dean are still out there
God is currently destroying other worlds, but alternate versions of Sam and Dean — who are very different from the ones we’ve gotten to know and love over 15 seasons — managed to escape the destruction of theirs to this one. Dean sent them off to Brazil near the end of Episode 13, but since they still exist, they could always come into play again. They were already used to potentially fool God if he took a look into the bunker while the others were on Billie’s latest quest, and they are hunters. And God could always find out they’re in this world and kill them (even only off-screen).
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Alternate John also came through the rift
As the Sams and Deans discussed their lives, the other world’s versions revealed that not only is their father alive (and he spoiled them and turned hunting into a financial goldmine), he also came through the rift with them but they were separated. With that mention of Alternate John, we know he could be somewhere in this world.
[Warning: The below contains MAJOR spoilers for Season 15, Episode 13 of Supernatural, "Destiny's Child."]
Michael is coming back before the series wraps up.
"Destiny's Child" saw the return of a few familiar faces — Genevieve Padalecki as the demon Ruby, Danneel Ackles as the angel Jo, and Rachel Miner as the visage of Meg being used by The Empty — as the final season continued. But that will be the last new episode "for awhile," according to showrunner Andrew Dabb, due to production being shut down because of the coronavirus pandemic.
With that in mind, we've put together all the important details you need to remember as we wait for the series to return for its final episodes.