As time goes on, more devices get updated to Android 5.1. The original Moto X has been slow to get updates, but now will get Android 5.1 in 14 new countries for retail models.
Those 14 new countries are:
- Hong Kong
- Saudi Arabia
- United Arab Emirates
So if you live in one of those countries, make sure to check for your Android 5.1 goodness. If you live elsewhere, hopefully Motorola and carriers worldwide will release updates soon.