It's fairly new. Just for some speed comparisons:
USB 1.0 is 12 Mbit/s, USB 2.0 480 Mbit/s, USB 3.0 is 4.8Gbit/s.
SATA (1st gen) is 1.5Gbit/s, SATA (2nd gen) is 3Gbit/s, SATA (3rd gen) is 6Gbit/s
Note that they will probably never have that kind of throughput, but that's the max ratings...