Something I've noticed that I haven't really seen mentioned is that Kylo's face scar is different in the final shot of his hand out to (presumably Rey, not necessarily. Movies!) than it is throughout the rest of the trailer with just a healed scar rather than the metal mesh he has throughout.
Makes me think it either takes place pretty far in the future and the movie's arc is fairly long, or is more likely a dream of Rey's possibly during her training. Similar to Vader/Luke/Cave.
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