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Furthermore, the signaling method, while still host-directed, is now asynchronous instead of polling. USB 3.0 utilizes a bi-directional data interface rather than USB 2.0's half-duplex arrangement, where data can only flow in one direction at a time. Without getting into any more technical mumbo jumbo, this all combines to give a ten-fold increase in theoretical bandwidth, and a welcome improvement noticeable by anyone when SuperSpeed USB products hit the market."
http://www.everythingusb.com/superspeed-usb.html
Basically USB runs in some fundamentally different, more efficient ways than USB 2 did. So it's not like they just 'sped up' USB 2.0. To put it in car terms USB 1 -> 2 was like taking a 4-banger and throwing a supercharger on it. USB 2 -> 3 is more like trading in your 4 cylinder econobox for V8 sportster. The backward compatibility really is possible because there just happens to be enough room in the plugs to put the same old 4/5 pin arrangement from the old standard along with all the pins for the new standard. They won't both be used all at the same time.
If I'm wrong somewhere in there, please correct me...