I'm out on a limb here, but I hear a rumour that you should get in touch with them if the following sounds like you:
- know Processing inside out
- can spare a couple of weeks (maybe it's your summer break from school or college?)
- are interested in experimental graphics and typography
- want to make art installations
- want to enhance your portfolio and work with some cool people
Update: Jody and Luke have posted more details on the Processing Forum.