Controlling your weapon mounted light has either required placing the unit in a way that it can be directly accessed by your support hand or via running generally annoying pressure switches and wires across the weapon. These pressure switches fall off, fail, or get snagged. They're generally annoying.
Crimson Trace has put out on the marked a wireless system that is controlled via the pistol grip of the rifle, avoiding the need to have to use your support hand, thus providing the ability to mount the light/laser in unique positions, and with no switches and wires to get snagged.
That said, wireless is...wireless and it also appears that this LinQ system is being poised as a scalable system with unknown potential future roles.