Google released a new version of the Android N Developer Preview to the world. This is the fifth and final developer preview before the consumer release of Android 7.0 Nougat, which is scheduled for some time in Q3.
There doesn't seem to be a ton of changes, but this release offers a "near-final" look at Android 7. Google is encouraging developers to test their apps against this version and stomp out any bugs before the final release. Android N brings a split screen mode, a notification panel redesign, additions to Doze power saving, and a ton of other changes developers need to account for. The Play Store is already able to accept apps targeting Android N, so once the testing is done, developers are encouraged to publish their Android N apps.
As usual, the Developer Preview is available via OTA update for devices in the Android Beta Program or you can flash a system image.