This will come in the form of OTA updates to Nexus phones, tablets, and also the Nexus Player. They should begin rolling out today, although it may take a few days for everyone to receive the update.
Additionally, since Android is open source, the source code for Nougat is being uploaded now to the public. Since the codebase is large, it will take a few hours to be complete.
You can see all of the Nougat changes to Android TV in the video below:
Nougat is going to continue the recent monthly security updates, now as part of the general update cycle. The next update will continue to add polish to the operating system and fix bugs. When will you see that? Google says the developer preview will be out this fall.
We’re moving Nougat into a new regular maintenance schedule over the coming quarters. In fact, we’ve already started work on the first Nougat maintenance release, that will bring continued refinements and polish, and we’re planning to bring that to you this fall as a developer preview. Stay tuned!
This means the developer preview model will likely continue beyond just this OS update. The Android beta program users will likely continue to get periodic updates beyond simple security fixes, much like Windows now has a beta program. This can be tough for developers to continue updating apps with every fix, but it also allows the team to move quicker to fix outstanding issues without breaking changes for every user.