Light Peak should be called Thunderbolt for now. There is no light, no fiber wiring of the home, and it's still capable. It's not up to the chipset to integrate this as it is it's own chip, and it ain't small...about as big as a Southbridge.
Right now, Lightpeak takes a break and releases what it has. Copper is good enough and we just can't expect home runners to know how to run fiber bends (Do you know someone that can run and bind fiber? I know two...me and one geek friend.) You can tell it's a break and not the full thing by using the mini-display port connector. The hope that it's full fiber may die, but saved for an update that may be called "Lightpeak"...but it's Thunderbolt for now.
When do I run my home with fiber? Probably in two years, so I'll get on that now. Degrades the copper LAN's though