Star Wars: The Last Jedi Trailer Breakdown: 21 Things You Need To See
5. Kylo Ren
And then there's the shot of Kylo Ren with his red Crossaber ignited, looking ready to meet the approaching challenge.
The trailer very obviously edits this to look like Rey is running towards a showdown with Kylo Ren, and in fairness that is what it appears to be, and would make sense.
However, such shots are often a case of misdirection, so it wouldn't be a surprise if they were separate shots.
After being left defeated at the end of The Force Awakens you can bet he wants revenge, so a showdown between them feels inevitable at some point. As we can also see, he's without his mask again here. Gotta make the most of those Adam Driver features, and it's not like he needs to protect his identity. It seems that the mask comes off when he really wants to make it personal, or just show off that badass (yet not as bad as it should be) scar.