It sounds like they're going to shotgun together some EVDO cards so they have enough bandwidth for a high quality stream? I wonder if they've created some kind of proxy to split up the stream and reassemble it with some hacked up cam-driver or something. Hopefully it's not too complicated a system.
Very interesting if it works out. Latency with EVDO isn't great, but mostly good enough. WiFi is pretty useless for mobile broadcasting because it's not very mobile.