The same update for the T-Mobile Moto X which included big camera improvements (amongst other things) is rolling out to Sprint about now. This Sprint Moto X update is version build 13.9.0Q2.X-116-MX-17-57-1. The update should be rolling out OTA now, but will do so in stages, so sit tight for now.
AT&T users need not feel left out though. We also found word that they sent out a soak test invite for the update for their version of the Moto X. Here's the soak test email,
"Hi,
Thanks for joining the Motorola Feedback Network. We are inviting owners of the Moto X on AT&T to participate in an early preview of a new software release, and provide feedback. If you are not currently using an AT&T Moto X, please excuse and ignore this email.
Click this link -- [redacted] -- to take the enrollment survey if you wish to take part. Note that you must be a member in good standing of the Motorola Owners' Forums to be included. The registration window could close without notice so please respond as quickly as possible.
This is a confidential test under the terms of the Motorola Feedback Network. Do not post any details or information about this on any public sites.
Thanks -- please understand that start times are always fluid. We ask for your patience if you register but don't hear from us right away.
Matt
Motorola Owners’ Forums
Motorola Feedback Network"
As is typical, there is no word yet on the update for Verizon owners of the Moto X. More than likely the update will come much later and Big Red users will be lucky if they get it before the end of the year.
Source: MotoXForums