Just saw the Teaser. Can I give a suggestion?
Keep the entire thing in B&W, but have Anakin in colour. Whenever he does a dark deed, lower his saturation slightly so that it isn't too noticeable but that by the end, he is completely B&W, with the exception of his eyes (yellow) - symbolizing how he was the chosen one and the person who was supposed to save them all but he blended into nothingness. Also you could keep the lasers and sabers in colour.
Something like that would take a long time, but if you like the idea just don't want to do it, if you passed your completed version to me I could help you with it? The most effective way to do it would be through roto-brushing (new to After Effects CS5).
Here's a video I worked on which demonstrates what I'm talking about: