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Dangling plot threads are a great convenience for a GM. In a movie, you usually want to make sure you tie everything up neatly to avoid frustrating the audience, but a game is a different thing. The players have agency over what threads they find interesting and want to pull on a bit more. So giving them lots of threads to choose from is the way to go.
You don't need a resolution for all of them up front. That's way too much preparation effort for a GM, and most of it will be wasted. Record a few vague ideas about each thread and flesh them out more when the players get interested.
Commentary by memnarch (who has not seen the movie)
Story time! No view of the floor mural unfortunately, but the scene's not over yet. The lighting is neat though. I'm curious how much of that was done with the sun and how much was lamps and light bulbs. A cave that looks close to this could be very cool to film in, but getting the sunlight just right would be a major pain if reshoots are necessary. And that's ignoring the weather causing problems as well!
I get the feeling Pete's last comment is a dig at the movie. Or maybe just Star Wars media in general; I'd be shocked if the "everyone and everything has backstory" that I remember from the Expanded Universe was dropped after the Disney movies started. That said, "question for another time" is almost exactly what Kanata said. Maybe that time is now? Kanata won't have anything to say, not being a part of the scene, but I bet Luke has some insight into that vision sequence that tossed Rey out into the hallway.
Transcript
Luke: The sword you offered me. It was mine... A long time ago, in a place far, far away.
Rey: I know. You lost it in Cloud City.
Luke: How did you get it?
Rey: I took it from Finn when—
Luke: Finn?
Rey: A First Order trooper who defected to the Resistance.
Luke: First Order? So... the Empire had the sword.
Rey: Well, no. He got it off Darth Kanata.
Luke: I don’t know a Darth Kanata. Where did he get it?
Rey: You know... he never said.
Luke: Some “question for another time” crap that never got resolved?
Rey: If there’s one thing I’ve learnt, it’s that there are no loose threads in this story.
Luke: Sorry to disappoint you, kid.