Update: Motorola is saying that the OTA was delayed slightly. It should start rolling out today 2/13.
Right on the heels of the T-Mobile update, US Cellular's Moto X is getting the bump up to version 4.4.2. This OTA started hitting a few devices last week, but now it should be rolling out to everyone. Head to the settings and check your update menu at your earliest convenience.
Android 4.4.2 isn't a huge update for the US Cellular variant of the Moto X (XT1055), but it's similar to the T-Mobile version. That means you can expect some camera tweaks, battery life improvements, and expanded Google print services, among other things. We'll know for sure once the changelog is posted.
Keep in mind the update will probably require the stock recovery and ROM, so get back on stock if you want to update.