Rey continues sprinting through the forest, her new Force powers clearly allowing her to be more nimble as she leaps wide gaps in a single bound. Her forest leap jump-cuts to a similar leap inside some wreckage (likely the Death Star II), which is familiar territory for her. Once a scavenger, always a scavenger...?
When we finally see Rey's face, she is wet and grungy, indicating that this sequence might be taking place after her big water battle with Kylo Ren that we have seen in previous teasers (and later on in this one)... OR she could just be really sweaty and dirty from scouring a decades-old wreckage.
Over these scenes, we hear the voice of Finn (John Boyega) explaining, "It's an instinct. A feeling. The Force brought us together." This is the same guy who didn't know "how the Force works" back in TFA? That, ladies and gentlemen, is Growth™.