Probably got lost in translation. I went to the English Focusrite site and got the opposite information so it seems ok.

"Can I use a USB 3.0 port with my Scarlett interface?
It is now possible to use the Scarlett with USB 3.0 ports. Ensure that you have installed Scarlett MixControl 1.1 then install v2.3 of the Focusrite USB 2.0 drivers. It is important that you install these in this order. Both of these can installers can be found on the relevant downloads page here."
It would be good to hear if anybody has problems with usb3 though for future reference.