Google just released the developer preview of it’s upcoming Android N operating system. The update is available for all the Nexus devices came after Nexus 5, sadly there is no flash available for Nexus 5 ( Good bye legend you will be remembered.)
It is an early built so even if you own a Nexus phone make sure it is not your primary phone. Google is asking the developers to install it on their secondary devices since it might have some issues. So take care of that unless you are some badass developer.
The new Android N features the Split screen display for using two apps at once, the new picture in picture mode and updates quick settings menu design.
You can download the flash image of Android N for your Nexus device HERE.
Source: Android Authority