USB 3.0 has 5Gb/s data signal rate but the USB 3.1 double up to 10 Gb/s. AsRock Offer two types of USB 3.1 card, the USB 3.1 Card/A+C, and USB 3.1 Card/A+A. The difference is Card/A+C has A and C types of port and the Card A+A has A type of ports.
I don’t know the release date but I think It could be possible to bundle with AsRock Motherboards. Or there is some motherboard of AsRock today equipped with USB 3.1.