What is it?
It's a game where rival programmers compete by writing fiendish strategies for simple robots. The bots and the field are open-source and are cheap enough that you could make your own!
Where can I get the source and design files?
There a bit of video here: http://www.detroitnews.com/article/20120527/OPINION03/205270309
Here's a picture of a chassis, before the electronics and weapons are added.