After a few delays, Mirror's Edge has received it's downloadable content. This new content (180 MB) is available for purchase at 800 MSP for both Gold & Silver accounts.
"Mirror’s Edge gameplay distilled down to its purest form and its purest vision in nine races across seven all-new and totally redesigned Time Trial maps. No cops, no guns, no city. Pure aesthetics, agility and flow that will challenge any Runner."
The content comes equipped with 5 new achievements for a total of 250 Gamerscore. See game page for achievement details.