A collection of comments, thoughts and images, some highly spoilerish and not all of them canon.
1. I framed through the end of the Vader vs. Obi-Wan battle in A New Hope after being a bit confused by it last night. Watch closely, and you’ll notice two things. First, Vader’s lightsaber appears to go through Obi-Wan’s, about an inch above the hilt. This I can pin on imperfect special effects and then get on with my life. However, the second thing is that Obi-Wan’s robes start collapsing before the lightsaber even touches him. Kelson, watching it, said, “Does Vader even connect with a body?” I don’t think he does. Which looks like a very plausible solution to the disappearing-Jedi conundrum: if Obi-Wan wasn’t actually killed in action, then all evidence points to non-violent death being the only way to disappear.
2. This time through A New Hope, I had the strange experience of mentally hearing a parallel voice track for Vader, with Hayden Christensen speaking many of his lines. I don’t know how much of this is my own overactive brain (fueled by coffee and Honey Smacks, no less) and how much is a reflection on the acting/directing/writing, but it’s very cool.