Google's Pixel and Pixel XL comes with some extra Artificial intelligence in the form of the fledgling Google Assistant. When activating Google assistant, Four dots slide out in each respective direction, and then quickly aligning themselves horizontally.
For now Google's Assistant is Officially Pixel exclusive, but it has been unofficially ported to tons of other devices via Xposed and other tweaks.
According to a new report from Stephen Hall (Senior editor at 9to5google), Google Assistant will be Officially available for the Nexus 5X, Nexus 6P and the Nexus Player soon along with a major update.
Google has already announced Android 7.1.2 Beta for eligible Nexus and Pixel devices. It could be possible that final build of Android 7.1.2 might bring Google Assistant and more features to existing Nexus devices.