Google released the fifth and final one today preview of Android 7.0 Nougat for developers, but anyone can try it.
Unfortunately for everyday users who want to try the latest Google OS, they will not see many changes. Changes focus on growth, and include:
pictures system for Nexus devices
an emulator for application testing
the final API of Android N
corrections and optimizations
If you are already enrolled in the beta program, you can see the updated one version.
Otherwise, you can sign up to try it out from here. Preview is available for Nexus 6, Nexus 5X, Nexus 6P, Nexus 9, Pixel C, and General Mobile 4G.