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The trailer isn't due to be shown till the opening of Harry Potter and the Deathly Hallows Part 2, tonight. But it was leaked online. I would post a link to a youtube video, but Warner Bros. are removing everyone uploaded, so here is a download link for it. The trailer is just over a min and a half.

    https://www.wupload.com/file/56082251/Dark_Knight_Rising.wmv

Nice I downloaded, looks awesome :p