Rumours are making the rounds that Sony are looking to demo virtual reality tech for PS4 at the upcoming Tokyo Game Show (Sep 19-22). It is a well known fact that Sony have looked in this direction in the past, but perhaps the PS4 is powerful enough where they feel it actually makes sense to launch a headmounted display for the system.
According to reports Driveclub will be used to demo the new hardware. With Oculus Rift stealing a lot of thunder a next-gen VR unit would certainly make a lot of sense.