Any USB cable has 2 ends. For USB 3, there are 4 different plugs:
USB3 Standard A Plug - looks like standard USB cord. Usually has some blue plastic inside it. Extra wires inside, wholly backwards compatible. This will almost always be on at least one end of a cable
USB3 Standard A Receptacle - the female version of the above plug. Used for extension cables and for universal cables (i.e., a USB cable that comes with a bunch of different ends for different devices)
USB3 Standard B Plug - Squareish. Usually used for printers and desktop external drives. Differs from USB2 in that it has a second little bit on it to carry the extra wires. The receptacle is backwards compatible, but the plug is not.
Micro-USB 3.0 Micro-B Plug - As noted above, wider than USB2's micro-usb plug, with a bit of a crimp in it. The receptacle is backwards compatible, the plug is not.
USB 3 micro cables are easy to find online, of course, but they're not carried in as many stores as USB 2 micro cables that are a common standard for cellphone chargers and so on. If you use a USB 2 micro in a USB3 micro receptacle, it will work, but it's going to be as slow as USB2 was. But so will a uSB3 cable if you're connecting it to a device that only supports USB2.
Of course the utility that came in the box supports it. Great that the Iridient thing does -- I've never heard of it. Sounds interesting. Will have to check it out even though I don't use a K3.
But yes, Apple and Adobe both have more complicated systems with quality controls in place, and neither one of them releases updates just for a single new camera. It would have been nice if they had the code in place for the K3 and Nikon DF (not sure if the 5300 or 610 needed updates) and whatever else was coming out following their last update in September (November for Apple), but Ricoh may not have released the information to them until the camera was officially launched.
Did either Lightroom or Aperture support dual white balances before? I know I can generate dual color profiles or something with my Colorchecker software, but I've never actually tried doing so and have no idea if they're supported in either program.