Rumours of a motion-sensing controller for the PlayStation 3 have been around for years, but it’s now been claimed that the controller does exist and that Sony will unveil it within months.

One of several sources that spoke to Variety claimed to have actually seen a working model of the mystery controller, which was first talked about back in 2007 when a Sony patent application for just such a peripheral was uncovered.

Apparently, the latest controller uses a small webcam to help it track its own movements. It’s also said to be much more accurate than the Wii’s Remote.

Two separate sources said the PS3 motion-sensing controller will be launched at the E3 videogames conference that’s set to kick off in early June.

Any such announcement will upset US company Performance Designed Products. It recently launched a wireless motion-sensing controller for the Xbox 360 called the Gametrak Freedom.

Sony’s still got ambitious plans for its PS3, though. Sony Computer Entertainment Europe’s outspoken President, David Reeves, recently claimed that the console will dominate the market within three to five years.

But it’s worth remembering that whatever Reeves may claim, in the end it doesn’t really matter – he’s retiring from Sony today. ®