Kennan, here's a snipped of info:
The optical cables were present and working just fine at NAB. They were being demoed at several booths including Intel, Promise and BlackMagic. Availability is supposed to be by the end of the year. Most of the demos had 100ft or so of cable on a spool with one end connected to a Mac, the other connected to whatever device they were demonstrating. I just want a 25ft. one or similar so I can move my two noisemakers into the closet. ;) This is the one advantage of having active electronics in the cables themselves -- you can use whatever transmission medium in between your connectors. I'm expecting them to be a bit pricey to start, but the Intel people were saying the price increase was negligible. We shall see. The fiber cables don't transmit power, obviously.