Luke is shocked by Rey's power, he's clearly surprised and actually frightened. He then says this: "I've seen this raw strength only once before, it didn't scare me enough then, it does now."
Let's think about this. The trailer openly suggests he's talking about Kylo because when he's saying this it shows a flashback to when Ben Solo destroyed his temple, and it also cuts immediately to Kylo Ren standing with his helmet on while his theme plays in the background. The trailer WANTS us to think its Kylo, because it makes sense doesn't it? Afterall Rey is there to be trained right? The last time Luke trained someone it all went wrong, hence the Kylo connection.
However read it again.
Luke says: "I've seen this raw strength only once before." ONCE before. If he was talking about Ben Solo that would mean Ben had more raw strength in the force than Obi Wan did, Yoda did, Darth Vader and the Emperor himself. Throw Leia in too, being the daughter of Anakin and Ben's mother. These are all known force users Luke has come face to face with... So, really!? I'm not having it. What would make Kylo some freak of strength compared to Luke, Yoda, Vader or the Emperor?
Then it raises the question about Rey. If Kylo is so incredibly powerful in the force, how was she able to beat him so soundly without any training at all and not even knowing what the force is...?
To me this this suggests Luke is instead talking about Darth Vader, the one conceived by the force itself. Renown for having incredible raw strength and power in the force and Luke's main nemesis and ultimate challenge in his Jedi life. This is why Luke is so scared, she see's his father's strength in her and he's frightened about what she could become. I just can't see Luke being frightened over Ben Solo, he could be sad or depressed about him, feeling like he failed his nephew, but not frightened.
So then who is Rey?
I think there's a chance that the trailer tells us straight up who she is, but it concerns Snoke. When he says: "When I found you, I saw raw untamed power, and beyond that something truly special."
Bearing in mind what Luke said above, this would suggest Snoke's talking to Rey. I believe in one of the new canon books it describes Snoke's manipulation of Ben as happening over time, years if I remember correctly. Both Leia and Han knew about Snoke. So it doesn't really fit if he's describing Kylo. But Rey, who frightens Luke with her "raw strength" seems more likely to be who Snoke is speaking to. And so if this is the case, it would suggest that Snoke found Rey at some point but she was taken and hidden away on Jakku somehow.
Another point to mention is that in the official Force Awakens novel, Kylo knows about Rey, when she pulls the lightsaber in the snow he comments, as if finally realising, "It is you." Throughout the whole Force Awakens story it is suggested people already know about her. Perhaps Rey is part of Snokes plan, like the way Anakin was part of Palpatine's plan.
So maybe Rey, like Anakin, is born from the force itself. I know this isn't a new idea, but the trailer seems to suggest something is going on with her beyond that of a normal powerful force user.
All of this would make even more sense if Snoke turns out to be Plagueis afterall.
could well be correct
