Usually there are two separate root hubs at motherboard in computer - one for 2.0 and one for 3.0 transfers. due to difference at physical layer of both protocols. Just remark, there isn't any direct USB 2.0 and 3.0 compatibility. Its a nightmare thinking about you have to order a new computer because your old one is damaged and that your loved gear cant be connected through a compatible MIDI-Interface Whats up? Does none of the manufacturers is willing to upgrade their gear for current connection standards like USB 3.0? Irs known that even many USB 2.0 devices have problems on the USB 3.0 bus. All that controller stuff and midi interfaces out there can stay on USB 1.1 or USB 2.0 forever. Yes, i know (speaking about the needed data throughput) that USB 3.0 would be 'overkill' for some little MIDI- or Controller-Data. So what if your gear (USB 2.0 or even USB 1.1) doesnt work correctly anymore on the USB 3.0 bus?

Modern computers often shipped with USB 3.0 only. I would look to reduce the latency somehow.Thats really annoying.

I haven't ever heard a rumor of a devices in the last 3 1/2 years.

Considering USB3 was released in late 2008 I wouldn't hold my breath for any USB3 specific controllers/interfaces.

Usb 3 midi interface