It was inevitable that some footage leak from the Green Lantern: The Animated Series screening at New York Comic-Con 2011. Two small clips have been posted on YouTube.com (catch them while you can), although when I say low-res, I am being very generous with the term. Actually these are below low-res, but if you are dying to see more from the first episode that airs November 11, 2011 on Cartoon Network then these will have to suffice.
We do get to see some Red Lantern action in the clips so, hopefully the low-res clip is worth it just for that. Enjoy!