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Well after some searching on the internet I found this:
DIGITAL version includes: - 44 minute making of - Game sound track - Motion comics, adapted from DC's Official comic series - E3 trailer and animated storyline - 40 page art book
Please note that the Digital Augmented version does not contain the bonus in-game/DLC content as the boxed version. However for US customers only, pre-orders with certain retailers will provide this content.