We know that Ezra, Kanan and Ahsoka are headed for Malachor to face Darth Vader (and cross paths with the "Old Master"), but the real juiciness of this clip is the new information about Malachor and a large Jedi battle that supposedly took place there ... not to mention a certain tri-saber design.
If you've played Knights Of The Old Republic II: The Sith Lords, then you know Malachor's fate depended on certain choices you made at the end of the game. Additionally, KOTOR II hasn't been declared as official canon by Lucasfilm, so anything that happened in the game doesn't apply to Malachor in Star Wars Rebels.
The big question will be how Malachor's story unfolds. Will it be completely new, or will those events thousands of years ago have an effect and be woven in? Could Revan be on the way? Or will he remain outside of official canon a bit longer?
Check out the clip below, and let us know what you'd like to see happen.