US Cellular, come on down: you're the next contestant on The Price Is Free. We've seen the first over-the-air update roll in for Moto X models on T-Mobile, Sprint, and AT&T, and now Motorola has posted details on a nearly identical upcoming update for US Cellular. That will probably makes Verizon the last major carrier to apply the Moto X update. Try not to act too shocked.
As you can see, the 139.12.57 follows the updates for other carriers point-for-point.