Google had released Android 7.0 Nougat a couple of months ago. Since then, the company had launched Android 7.1 Nougat along with their Pixel devices, a variant of the OS which comes with some additional features which are exclusive to Pixel devices, even though the update itself will roll out to other devices as well, but without some features. In any case, many smartphone manufacturers are working on updating their devices to Android 7.0 Nougat, and Samsung is one of them. The company had announced their Galaxy Beta Program last week, which is essentially a program which allows owners of particular Galaxy-branded devices to install beta versions of upcoming firmware for Samsung's devices.
The company had already launched Android 7.0 Nougat beta to the Galaxy S7 and Galaxy S7 Edge, but only in certain regions. You do need to download the Galaxy Beta Program app and have an active Samsung Account to install the firmware, and it is available only in South Korea, United Kingdom, China and the US at the moment. That being said, it seems like Samsung is working on Android 7.0 Nougat update for a couple of more devices. The company had announced recently that Android 7.0 Nougat development for Galaxy S6 and Galaxy S6 Edge is on the way, and now SamMobile confirms that Samsung is also working on such an update for the Galaxy Note 5 and Galaxy Tab S2. Do keep in mind that the update won't land for another couple of months, though, at least not the stable version, but it is possible (and probable) that the company will release the beta version via the Galaxy Beta Program app in the near future.
We still don't have any specific info regarding the update, but we will let you know as soon as Samsung releases some official information. As far as features go, you'll probably get all the features that are included in the build that the company had released for the Galaxy S7 and Galaxy S7 Edge, plus some additional ones due to the fact this is the Galaxy Note 5 we're talking about, so the company will probably include some features that were available on the Galaxy Note 7. The build for the Galaxy Tab S2 will also be a bit different, mainly because this is a tablet, though no matter whether we're talking about the Galaxy Note 5 or the Galaxy Tab S2 you can expect some main Nougat features Google introduced to be included in both devices, like the all-new notification shade options, always on Doze, etc.