Leaked photographs have appeared online appearing to show a prototype PlayStation controller with a touchpad alongside the classic DualShock-style controls.
See the photographs here.
Since the first PlayStation console launched in December 1994, Sony have sold over 310 million home consoles worldwide, and 2.9 billion games.
PlayStation 4 is expected to be unveiled tonight. Sony is due to hold an event in New York, promising to reveal "the future". But it's keeping people guessing and won't confirm widespread rumours that the latest version of the console will be launched.