I work in the semiconductor industry and specifically do physical design of high speed data chips. I work on a team that develops USB chips. What the consumers typically don't know is that when USB 3.0 was first spec'ed no one was designing a chip to hit the numbers so they backed off on the specs and allowed a 'phase 1' release of the USB 3.0 chips that didn't have to meet the 5gbps speed. Later on the 'phase 2' chips were released that now meet the speed. But since the consumers only see USB 3.0 there's really no easy way to tell which release they have short of doing some evaluation. The USB committee issues what's called a logo (USB Super Speed) to chips that meet the speed so some machines will display the super speed usb 3.0 sticker (much like the Intel Inside sticker). If it has this sticker it meets the 5gbps speed.
Now, onto USB 3.1, which our team is currently working on. The story is the same. No one is meeting the original spec'ed speed yet (that I know of) but there are machines shipping with the USB 3.1 listed. Again, these, as far as I know, are 'phase 1' releases and do not meet the 10gbps speed yet. The phase 2 chips are still in development and when released are designed to meet the spec'ed speed.
Ron