USB 3.Optical is a cable technology by Corning to extend the range of USB 3.0 while maintaining high bandwidth. Like the eventually realized promise of Thunderbolt, the cable is a stretch of fiber-optics between the two end points. The currently available SKU is a 10m male-to-female USB 3.0 A to A cable (a ten meter USB 3.0 extension cord). The idea is that users will plug their intended cable to the female end, as if it were the actual socket on the computer.
The cable is actually currently available, right now, on Amazon. The catch? A 10m cable is $110 USD. This is around three-to-four dollars per foot. Needless to say that it is probably a bit too expensive for a "just in case" purchase. However, if you have a significant need for it, a cable now exists. The company also expects to ship 20M and 30M cables at some point this year.
One thing that is not clear is whether these cables are powered. I do not see anywhere which claims that it can transmit power. There is little reason why not, you could fit two extra little wires and put a 5V drop between them pretty easily over those ranges, but I expect that they did not.