Sony has registered "PlayStation Move" in Europe, and is potentially the name of the upcoming motion controller - previously thought to be Arc.

The filing for the name was made in Europe yesterday and could signal that the name "Arc" has been dropped.

Sony will be holding its press conference for GDC today where hopefully the company will spell out its plans for the long talked about motion controller.

A rock solid CVG source at GDC in San Francisco has told us that not only does PS3's motion controller have a nunchuck add-on - but that it connects wirelessly to the main device.

Our source corroborated a previous post on NeoGAF, which revealed that the nunchuck features an analogue stick, with X and O button beneath it, and a d-pad below. On the underside of the unit are L1 and L2 triggers.

However, the wireless connection info is new - and another differentiation between Sony's device and Nintendo's similar Wii Remote controller.

Frustratingly, no brand name appears on the peripheral - so we can't yet confirm or rubbish claims that the peripheral will be called 'Arc'.

CVG's source had seen and handled the device - but hadn't yet used it in action.

We're expecting full details tonight from Sony's announcement at GDC (midnight GMT).