MathUser said:
http://www.starwars.com/news/abc-to-air-star-wars-rebels-spark-of-rebellion-with-a-new-scene-featuring-darth-vader
Strange that none of you are talking about the James Earle Jones scene.
That's because it hasn't aired yet. This is actually the first I've heard of it. That's awesome that they got James Earl to reprise the role, definitely have to check it out when it airs.