The majority of USB3 devices will appear within rekordbox and will be recognized by the CDJs. There is no advantage to these devices on the CDJ end, however, as even four 24bit 96khz streams don't get anywhere near the maximum throughput of the USB or ethernet LINK connections. For the devices that are not supported, chances are they will not be in the future; the majority of the market's USB chipsets ARE supported, for those that aren't, it's simply an incompatibility that Pioneer can't necessarily address.