It's easy enough to test if they emit IR or not. Perhaps they missed it, but logic shows there's no IR LED in there (certainly not capable of significant output).
It's not even finalised!
It would need to have a specific visible position though, which isn't a requirement of the setup. Sony have no idea what position or orientation the console is, or even if it's visible at all. If they want to go that route with an illumination source, they should (and would) use a Wii-like LED array on a wire that can be positioned independent of the console.
You're describing a Kinect-like TOF camera which needs amazingly fast sensors. It's completely unnecessary. Sony have a very robust and affordable visual triangulation system coupled with MEMS. They have illumination on the headset for tracking relative to the PS camera, and the same with Move tracking. It's more accurate than TOF and lower latency, and cheaper.