And it turns out Adam was talking about the princess in the Hidden Fortress, not Rey:
Driver is on a roll now, discussing what excites him: character and narrative and cinematic influences. The original Star Wars was an homage to Akira Kurosawa’s 1958 film The Hidden Fortress, he says, and the link lives on in the new trilogy, in which concealed identities drive the narrative. Then he lets it slip.
“You have, also, the hidden identity of this princess who’s hiding who she really is so she can survive and Kylo Ren and her hiding behind these artifices,” Driver says, apparently dropping a massive revelation about Rey’s royal origins.
One story Canon has taken a very different approach with from Legends is Leia’s Force sensitivity. In the Legends, she trained on and off for years, eventually becoming a full fledged Jedi Knight. In Canon, she seems to have avoided developing her potential entirely. The recent trailer may give some insight as to why.