I noticed early this spring USB 3.0 silica started to come out from the gate.
This brings asynchronous transmission, full duplex, higher current, not counting the theoretical 4.8Gbps transmission rate, which sould be all pluses for bit perfect audio.
I did not look which "new" laptop has USB 3.0, but I can already see there will be a new generation of USB 3.0 DAC around the corner.
Quoc