UPDATE 10/06: Geoff Keighley of Gametrailers.com (@geoffkeighley) tweeted that the new Mirrors Edge trailer shown at this years E3 is not actually Mirrors Edge 2, but in fact an origins story.
His tweet came shortly after EA made a press release following the end of their E3 presentation.
This announcement would explain why the main character, 'Faith', was getting her iconic tattoos applied during the trailer. So whilst it may not be a sequel the fact that there will be another Mirrors Edge is still something to be excited by.
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Mirrors Edge 2 is now official!