The spec is out. The Intel spec controversy is over, though I believe the FTC are investigating that as part of a wider investigation into Intel's business practices.
Motherboards using it either need a chipset supporting it (which won't be until AMD refreshes their chipsets in Q2 at least, or Intel does so in 2011 at the earliest) or an add-in chip (which DO exist, but are not widespread).
There's just no need for USB3's bandwidth at the moment, except for external storage. There needs to be the whole 'ecosystem' - USB3 devices, controllers, connectors and PCs - in the majority of the market before it actually works. If any piece is missing, you won't see the effect.
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SSD drives will get cheaper! Later this year you'll be able to buy 160GB for ~$225 or 600GB for ~$500. That's huge progress over a few years ago. Since flash is now made on silicon processes, it gets Moore's Law applied - twice the transistor density every two years. Flash was 50nm at the beginning of this year; vendors are moving to 34nm, and it will carry on. Flash should, assuming correlation with silicon area, get twice the capacity at the same price or, half the price for the same capacity, every year. That's faster than hard-drives ever came down.