So here's a sort of "off the wall" question - is the DeX really going to just be a "S8/Plus" accessory, or if Samsung chose, could this not be used for other high end Android devices that would physically fit with a USB-C connector? I'm thinking that DeX (beyond the hardware of the docking station) is primarily software that could be installed on other devices.
Obviously, Samsung would charge for it (and hopefully would be free on Samsung devices), but if that could be done, it would probably help ensure more widespread adoption.