We know that the filing is the Moto X, because the listing has it as the XFON, just like what we've seen before. This model is listed as XT1055, which goes along with the other models we've seen for Verizon (XT1060), AT&T (XT1058), and Sprint (XT1056). This model also has the LTE band 12 built-in, which matches the U.S. Cellular spectrum.
Everything seems to be coming together for the wide launch that Motorola is aiming for with the X Phone. Of course, the device is stacking up to be more of an upper-mid-range model (as was expected all along) with a Snapdragon S4 Pro, 2GB of RAM, 720p display, a 10MP camera, and the various sensors that will know what you're doing at all times.