A few weeks ago Android Developers at Google had announced that Android 7.1 would come in the form of a Developer Preview, first for the older Nexus devices to the dismay of many Nexus owners. Almost a week ago they officially announced that the preview would come to Nexus users within the month of October. Well it is finally out today.
Android 7.1 Developer Preview 1 (NPF10C) is an incremental update to Android 7.0, so if you are expecting major features found in the Google Pixel, you may be disappointed. What you will find are launcher shortcuts, round icons, and image keyboard support.
Below is the changelog for the Android 7.1 Developer Preview.
We’ve finalized the new APIs as API Level 25 We’ve opened up publishing on Google Play for apps targeting the new API level, so you can update your apps soon as you are ready.
This is currently available to the Google Nexus 5X, 6P and Google Pixel C. To get the 7.1 release on your eligible device, enroll your device in the Android Beta program. If your device is already enrolled, you'll receive the update automatically.
As always be careful - this is not a finalversion so may contain bugs and as such is not recommended for your daily driver. More devices are expect to be supported by the end of November with a final build to come by the end of the year.
source: Android Developers