Hey,
they have only defined the Standard. There is no one currently how is building devices with this Standard.
you will get the first devices maybe at the end of the year or next year if they have no issues to build a solid Controller.
To my knowllege there are some soundcards which have the Label USB 3 but they use mostly the USB 2 Standard because they don't Need more power

. And you can run the USB2 device without a Problem at an USB3 port.
regards
Christian