The beginning of the trailer shows Obi-Wan travelling 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 the planet where he meets his friend and future padawan Anakin Skywalker (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."
Image Source: YouTube user Star Wars