Google released a second Android N developer preview two weeks ago for the Nexus 5X, 6P, 6, 9, 9 LTE, and Pixel C. That's quite the list, but there was one circular Nexus device that didn't make it.
That's the Nexus Player, and now Google's quirky little set-top box is having its turn to experience the love. This was the only device to be delayed. The build has gone out as version NPC91O.
It's okay if this is the first time you're installing Android N. Things should still work, and you don't need to join the beta.
- Android Developers