Interesting, though it seems there isn't even a manual for it yet.
But it's a good thing ASRock aren't the only ones with consumer boards supporting it anymore.
I just looked it up: the Gigabyte GTX 970 ITX came exactly one month after the launch of the reference 970 so mabye they'll arrive with the same or less delay. Regarding the rise of SFF gaming they might hit the market faster this generation.