First-generation Motorola Moto X is updated to Android 5.1 in three countries
The update has been sent out OTA to U.S. and Brazilian retail units, and for Rogers customers in Canada totin' the model. Since the update takes the device from Android 4.4.4 to Android 5.1, it includes Lock Screen notifications, Material Design, the new Recent Apps page, the Quick Settings flashlight, enhancements to Quick Settings, the ability to open multiple user accounts, screen pinning, Battery Saving Mode, 64-bit ART compiler that opens apps faster, and the Smart Lock that allows a trusted device to unlock your handset.
Motorola recommends that you be connected to a Wi-Fi network while downloading and installing the update, and that your battery be charged to at least 50%. Because the update is being sent out on a staggered basis, it might take several days before you receive it.
source: Motorola, +DavidSchuster via AndroidandMe