To Download the firmware for the devices is here. It is good for the Nexus, 5X, 6P Nexus, Nexus 9, Nexus Player, Pixel C, General Mobile 4G and Sony Xperia Z3. If you participate in the beta program, the update will come to you even in the air.
Google consistently releases a Developer Preview for Android N - the new major version of the OS, which will soon be appearing on our devices. And now the search giant already distributes Developer Preview 4 build NPD56N, which already has all the final API for developers.