To participate in the soak test, you need to own a Verizon branded Motorola Moto X, be a member of the Motorola Feedback Network and swear to keep information pertaining to the test confidential. You can read the email sent by the Motorola Feedback Network below. While there is no guarantee that the soak test involves Android 4.4, the timing would seem to indicate that Verizon's Moto X users will be getting a break of that KitKat bar.
Our source tells us that this update could be the same one that brought LTE band 4 to the latest batch of Motorola DROID models for Verizon.
Thanks Anonymous Tipster!