I have no access to insider info, vendors, etc. and this is my own speculation so take it with the required grain of salt, but this description pretty much fits the Sonnet Allegro Pro USB 3.0 card that came out earlier this year. The regular non-pro Allegro (I have one of these installed in my 4,1->5,1) runs completely on internal power from the card slot and requires no additional wires or drivers. It had 4 ports sharing 1 controller. It has worked flawlessly for me. The Pro version features 4 USB 3.0 controllers and 4 USB 3.0 ports for more throughput per port if you connect many devices. Pretty easy to imagine Sonnet evolving this product line into a USB 3.1 solution. Sonnet's current USB 3.0 cards are pricey but they are fire-and-forget and hassle-free once they installed and that justified the extra cost for me.
It's not to say that Sonnet won't do something like that, but that's not the vendor I was referring to. The vendor i was talking about is currently redesigning the card (it wasn't even released to retail) so the release schedule has been moved back. With the lack of an updated driver from OS X, the vendollr is in no rush now (which is probably a good thing).
Sorry but that's not it... Read my review of the pro card in Post #1466
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