Dan Harmon back with you after a few weeks.
If you actually read the the above page on the Intel Research site concerning Light Peak, I think they state it pretty well when they say: "Light Peak also has the ability to run multiple protocols simultaneously over a single cable..."
That sums of the heart of the matter of why Light Peak and SuperSpeed USB are complimentary and not competing.
Light Peak is a transport medium that does not include a protocol.
As such Light Peak must have a protocol running on top of it to actually transmit data from point A to point B. What protocols can run over Light peak? Name one – USB 3.0, IEEE-1394, eSATA, HDMI, or DisplayPort – and they can run over Light Peak. The real beauty of the technology is that the bandwidth is high enough starting at 10Gb/s and scaling to 100 Gb/s in the future to run multiple of these protocols simultaneously over the same fiber connection!
One remaining item to be cleared up still with Light Peak is the economic feasibility of it. Historically high–speed optical transmission has NOT been inexpensive. I know Intel is claiming that Light Peak will be on par with existing cable technologies, but that still remains to be seen - especially the when part of it.
Talk to you again soon, Dan