Beyond Unreal have picked up on the Mirror's Edge community discovering something interesting. More details in the link, but basically involves copying the wxRC and wxRes folders from UT3\Binaries to Mirror's Edge\Binaries and then running the Mirror's Edge executable with an editor modification thingy to the file's properties. Here's a custom map the community have magicked up. You may have to be quick, however. Chatting to our industry contacts, you apparently have to pay an additional fee to ship a game with UnrealEd, making them suspect it'll be patched out sooner or later. Which is a shame: if any game could do with some user-generated maps, it's shining-in-speed-trial-mode Mirror's Edge.
A new major update is close though
We've been talking, and we think that you should wear clothes
Total coincidence, but we sell some clothes