First-generation Motorola Moto G receives Android 5.0.2 update
Other new features include the ability to have multiple-user sign-ins, a display showing the estimated time until the battery completely charges or discharges, and the 64-bit ART compiler that speeds up the opening of apps. Smart Lock allows you to use an Android Wear powered device (like a Motorola Moto 360 smartwatch) to unlock your handset.
While the size of the update wasn't listed, we know from other Android 5.0 updates that this is going to be a huge file. Such heavy lifting not only requires a truss, it actually means that you should be on a Wi-Fi connection before downloading and installing the OTA update. Motorola suggests that you have your battery charged to at least 50% before starting the updating process.
One last note. Since the update is being sent out on a staggered basis, you might not see it hit your device for a few days yet. There is no need to get upset. Just when you're about to send a strongly worded letter to Motorola and your carrier, the update will hit your Moto G.
source: Motorola via AndroidCentral