"Google has announced that the latest version of Android, 7.0 Nougat, is rolling out to newer Nexus devices starting today. It’s a good upgrade, but only available if you have a recent Nexus device like the Nexus 6, 6P, 5X, Pixel C, or Nexus 9 tablet — and it will take some time for everybody's devices to receive the over-the-air update. I've been using the various public betas that have been running since March of this year and most of the bugs have been worked out.
Nougat isn’t radically different from the last version, Marshmallow, but does add a handful of notable user-facing features. Some of them, like improved multitasking, are long overdue and really useful on tablets. The rest are tweaks around the edges — but there are bigger changes underneath that should make Android faster and more secure, too.
But the story of Nougat isn't really whether it’s any good. Instead, it’s the same old Android tale: unless you have a Nexus, it could be a few months, it could be a year, before it becomes available on your phone. The real story of Nougat isn't happening today, it's going to happen over the next few months as we watch to see which Android phones will actually be updated."
Android 7.0 Nougat review: great, but does it matter? | The Verge