Sony has filed a number of patents that could indicate a PS4 virtual reality headset is on the way.
Highlighted within the audio system patents are methods of alerting players to real-world emergencies, while details of the head mounted display refer detail head motion detection and imagine stabilisation.
Both patents together would certainly indicate a device capable of rivalling the Oculus Rift.
Revealed yesterday, the patents were filed by Sony back in May 2013. Internally, the device has been demonstrated with first-party racing title DriveClub.
The device is expected to make its debut next year, with a potential reveal scheduled for Gamescom 2014.