Looks like Rey is featured heavily in this trailer and she looks to be a lightsaber wielding badass. Also. The Emperor has some new voice work and what sounds like a taste of Darth Vaders iconic breathing sound. The end of the trailer has had fans guessing what it means as Rey snaps a double-bladed red lightsaber out and looks very ... pro dark side. It's possible this is a vision caused by the Emperor of her dark side ability like we saw in Empire with Luke and the force cave. Or... it's something else entirely.
Rey will get into her dark side attire in Star Wars: Rise of Skywalker which comes out on December 20th.