<_< I know, but that doesn't mean there was anything substantial finished. All the VP said was that the game was in production. That's probably just engine development, concept art, story planning, etc. Doesn't mean they have a workable title done at all. You guys are acting like they had the thing halfway done, when really it didn't look like they had anything worthwhile completed at all. That's aside from the fact that it hasn't been canceled! It's just on hold until they can spare the manpower to develop it, which they obviously don't have right now with a huge title coming in Battlefield 3.
My first question is how do you know? No one here knows the extent of the prototype that DICE developed, as far as I know. They could have easily had the animation rigging done already - that alone, really, is what's substantial about the game and its most complicated part. Making a character walljump is nothing new. Making the character walljump realistically is a bit more of a challenge. Aside from the play style, there wasn't all that much about Mirror's Edge that was difficult from a game design perspective - no huge amount of characters on screen, no fancy AI, and the graphics, while awesome in their way, weren't computer-killers.
Plus, the game used UE3, which is now available to most people via the UDK (Unreal Development Kit). Give some enterprising people some time with the UDK, a sound studio and some animators and maybe a mocap system, and you could probably get something like Mirror's Edge released pretty quickly. I mean, look at what http://www.moddb.com/mods/mirrors-edge-source-trailer-map did in the Source Engine. There are also groups looking to develop a Mirror's Edge mod / game in the Source engine.