Google may not be supporting the Google Nexus 5 any longer and this means that it won’t be getting updated to Android 7 beta.
The Nexus 5 is considered to be an old handset as it was three in November and so Google think of this as an old device. As such they don’t have to send out security updates anymore.
The Google Nexus 5 is going to start a new life and this is thanks to developers who have come up with a custom ROM.
The Nexus 5 is loved by developers and therefore it will be just a matter of time before they launch a custom ROM for the device by way of CM14.