Siliconera recently uncovered a patent for a mysterious Sony hand held controller, and when we went looking we discovered several different variations.
The embedded images are from three different patents that we
unearthed, each it seems variations on the standard concept of a
controller that's not too dissimilar to the Wii Remote. It lacks the
unnamed motion controller's essential orb (pictured below), so either
Sony has managed to make this a little more subtle than the prototype
design or it's a controller for something else entirely.

Unfortunately there's a distinct lack of information in the patents,
beyond the fact that they're hand held controllers and registered by
Sony Computer Entertainment back in July 2008.