"from the headset a cable travels 5 meters to a little box. that box has two 1 meter cables that come out of it (displayport and USB). that little box also has power input, you will use a 45W notebook charger that comes in the box, plug that into the wall and the barrel end into the little box."
That answers my question as to how that extra power needed would work.
That's basically the same as the Vive.