As a surprise Moto G 2nd Generation updated by Lollipop quickly, even quicker before the Nexus devices update.
But it made the first generation owners to feel like they left in the cold,but they also think that it was not been long since they buy their phones.It looks that they won't wait for more time.
In the 1st generation Moto G Motorola updated the Motorola Update Service App.The changelog for the App says that this update is necessary to enable a future upgade of users device to Android 5.0 Lollipop.
The time of arrival of the update was not known but it probaly not so long fom now.