Update:
Here's a short interview with one of the developers of Mirror's Edge. Now we know the premise at least, and if it's heading in the direction I'm assuming it is (just a guess, but I'm thinking she's going to have to deliver a package/message that is highly sensitive and as a result attracts the attention of the local authorities or the powers-that-be) than I'm even more anxious to get my hands on it.
Sneak Peak: Mirror's Edge - Pixel.tv