Last month, owners of the Motorola Moto Z and Moto Z Force received the update to Android 7.0. Today, the Moto Z is once again receiving a new OTA update.
Unfortunately, Android 7.1 is not contained in the files being received. The only change listed is a fix to the notification volume, which suffered through a drop in decibels following the update to Android 7.0. The build number is NPL25.86-17-3.