Google has just made the fourth Developer Preview available for download. This update includes a final set of APIs so developers can begin compiling their apps and publish them in Google Play. Developers will also be able to run alpha and beta tests of these apps that target API 24 through Google Play if they wish.
From the :
Now that you have a final set of APIs, you can publish updates compiling with, and optionally targeting, API 24 to Google Play. You can now publish app updates that use API 24 to your alpha, beta, or even production channels in the Google Play Developer Console. In this way, you can test your app's backward-compatibility and push updates to users whose devices are running Developer Preview 4.
You can right now, or wait a little bit longer for the OTA's to become available.
The Android N Developer Preview is just that — a developer preview. While it's now "release candidate beta" quality we still have to issue a word of caution. Tread lightly.
From the :
Now that you have a final set of APIs, you can publish updates compiling with, and optionally targeting, API 24 to Google Play. You can now publish app updates that use API 24 to your alpha, beta, or even production channels in the Google Play Developer Console. In this way, you can test your app's backward-compatibility and push updates to users whose devices are running Developer Preview 4.
You can right now, or wait a little bit longer for the OTA's to become available.

The Android N Developer Preview is just that — a developer preview. While it's now "release candidate beta" quality we still have to issue a word of caution. Tread lightly.