Google Nexus devices are traditionally the first to receive each new version of the Android operating system. But sooner or later the older ones are being left behind, not updated. The next would be the Nexus 4, Nexus 10 and Nexus 7 (2012), which would be out of Android M due to new policies of Google.
Since the introduction of Android M, there has been doubt about whether Google would update all smartphonesthat received Lollipop or not, or if the other side would abandon the range of 2012 and before, which despite years standing still hardware of first level able to move very fluently with Android. Reason for this is that historically Google has always been committed to providing a minimum of 18 months of support (although in practice they have always give two years), but this commitment does not mean they can not improve it to keep up. Unfortunately not likely to be so.
There has been talk that they might be labeled a small hope that Android M came to them, but as noted by Artem Russakovskii there is not indicate anything about it. For those who do not know, stands for AOSP (Android Open Source Project), which corresponds to the open source core of Android, which gives us clues about the activity they are getting for each device.
This means that so far no conclusive evidence that they are working on it. These devices could let us think tagged find an opportunity, but it is a hope that we should not embrace. From our part, we would like Google continue to maintain support to its line of 2012, as were the first Nexus devices to create a real stir in the landscape, yet are an example of what Android is capable of achieving.