I just know seeing that "show" they do in front of the Great Movie Ride with the vignettes from all the Star Wars eras featuring characters in front of an LED screen, every single one of them has a mask. Okay, well except Darth Maul, I guess you could consider him a face character. But Chewbacca, Stormtroopers, Phasma, Kylo Ren, Darth Vader, C3PO, all masked, and R2's a robot, BB-8's a bot, etc. As I watched that the other day I was wondering if they'd ever have actual face characters like Luke or Han. So it's cool to see Rey show up last night. Hope it wasn't just for the celebration though.
And the Seventh Sister is from Star Wars Rebels right? I don't watch the cartoons, just the films, so I don't know who that is. But the more characters in the parks the better.