As much as possible, we're going to try to build this out of crap we have laying around. We have loads of old/crappy/partially broken LCD monitors which can be scavenged into an array, and we've got enough video cards and slots to run at least 10 screens from a single motherboard.
The software side will be fairly intensive as well, the game will probably be a single XWindows program in C, called from a set of scripts which configure everything. The game will feature the user as an "operator," who can direct the human inside the matrix to achieve his goal and escape the agents. The operator will have to use this massive array of screens to acquire the necessary data so he can instruct the human on the inside correctly. The human inside the matrix can either be a human, or, ironically, an AI with speech recognition. I plan on releasing the code under the GPL, though some of the scripts may not be all that portable.