Get ready to Move. Sony boss Shuhei Yoshida confirmed this morning in a roundtable discussion that the shiny little light bar on the back of the DualShock 4 controller is for PS Move-like functionality.
He called the rear, multicolored light an extension of of the PS Move technology, and not just a way for the system and PS4 Eye to identify your player number. While anyone would have guessed this, it's nice to have confirmation.
Yoshida said, "It's an extension of the PS Move technology that we incorporated into the DualShock 4 so that the camera can see where it is."
via destructoid http://www.destructoid.com/dualshock-4-light-confirmed-for-ps-move-functionality-246235.phtml