Time to hunt for those hidden IR LEDs. Since the HDK 2 is built to be accessible to developers, we aren't surprised to learn the headset's gatekeepers are friendly Phillips screws.
But with the screws removed, the faceplate seems to be held in place by some mystical energy field. We suspect either wizardry or more likely, the Force.
The HDK 1.x models had some issues with cables ripping apart. The HDK 2 seems to have remedied this with a beefier cable and a ZIF connector.