We recently reported on a last minute addition to the GDC schedule where Sony's Shuhei Yoshida, Richard Marks and Anton Mikhailov will speak on the vague subject "Driving the Future of Innovation at Sony Computer Entertainment". Now Edge claim that this is where Sony will finally unveil the long rumoured virtual reality headset for PS4. Sources claim the device will be unveiled, but that we shouldn't expect much more than perhaps some kind of tech demo from first party, but the Edge source claims that prototypes are already in the hands of third-parties - a prototype far superior to the first Oculus Rift iteration.