I have no idea what they did at CES, but Sooloos will come right and tell you that for superior sound, you need to use an external DAC.
What I want to know is, if the Slimdevice Transporter can have a clock link, then why can't the Sooloos units. If it did, I think it would come closer to legitimizing itself as an audiophile product. In fact, given all the jitter, noise inherent with a PC/computer, I have to believe that a clock link will become all the more necessary, as we push more and more into digital music. I will wholly admit I know little of the technical complexities of such a link, but based on the comments from Lessloss above, it sounds like no small challenge.