So far, the Moto X has seen the latest KitKat update at other major carriers in the US, as well as for the unlocked version, which actually not a common occurrence, especially when you consider Verizon’s Moto X has already been updated. Big Red is notoriously, how some might put it, methodical (slow) in its evaluation process of OS updates to devices on its network.
Given how quickly the whole line of Moto X was getting updated to the newest Android version, it was just a matter of time for AT&T users.
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source: Android Central