The beginning of the trailer shows Obi-Wan traveling through the familiar sands of Tatooine, which is a desert planet we've seen numerous times in the Star Wars universe, including most recently in "The Mandalorian" and "The Book of Boba Fett."
As we know, Obi-Wan has a lot of history with Tatooine. It's where he meets Anakin Skywalker, who becomes his friend and Padawan (and who later becomes Darth Vader), and it's also where he first fights the Sith Lord known as Darth Maul in "The Phantom Menace," who he later faces again on Tatooine in the 2014 animated series "Star Wars: Rebels." The planet is also where Star Wars fans first meet Obi-Wan in "A New Hope."
