USB 3 isn't due out in the shops until 2010, I think the SATA 3 standard is supposed to be out around summerish but it'll be a wee while after that until device are out for it.
EDIT: Whoops, apparently the "first half of 2009 for retail devices" is the SATA 3 ETA, but there's been hardly a squeak about it so I'd not hold your breath.