Hello Matthias
Galvanic isolators using our current technology can cover USB low and full speeds, up to 12Mbps. We think we can push it to cover high speed, 480Mbps. USB3 is 6-12x faster than digital isolators can operate. To have Gb speeds in an isolator, you would have to go to fiber optics.
There are no USB3.0 chips on the market
There will be usb2.0 high speed chips in the future
USB3.0 is likely beyond the capability of digital isolators.
Best Regards,
MSCantrell