I am sure there are people out there are asking, when is android 7.1 Nougat coming to my phone? Only Google will be able to answer that question and they have. The Developer Preview will be available to the following, Nexus 5x, Nexus 6P and Pixel C.
At the final release of the Android 7.1.x platform, due in early December, they will roll out updates to the full lineup of supported devices — Nexus 6, 5X, 6P, 9, Player, Pixel C, and supported Android One devices — as well as Pixel and Pixel XL devices.
As with any beta, it is to allow developers to prepare their apps for the new features that will come with 7.1 Nougat such as:
Daydream VR support
A/B system updates
App shortcuts (like Apple 3D touch) - Use app shortcuts to surface key actions and take users deep into your app instantly.
Image keyboard support — expands the types of content that users can enter from their keyboards, letting them express themselves through custom stickers, animated gifs, and more. Apps can tell the keyboard what types of content they accept, and keyboards can deliver all of the images and other content that they offer to the user.
Storage manager Intent — lets an app take the user directly to a new Settings screen to clear unused files and free up storage space on the device. Which will be music to many users ears
For those that have seen the latest offerings from Googles Pixel phone campaigns, such as Google Assistant and Pixel Launcher. These featured will be exclusive to Pixel Handsets.