Here's A Featurette for Justice League: War Animation

http://www.youtube.com/watch?v=h7tnj8xY4oY There isn't any actually footage of the upcoming animation, but they do show some of the storyboards which is cool and I'm guess is some rough voice acting. It's kind of cool so check it out or skip to the end just to see who does all the voices.

Via Comic Book Movie