The most notable feature of Android Nougat is multitasking. You can multitask two ways: split-screen (see photo) or by double-tapping the Recents button to quickly switch between the two most recent apps.
To activate split-screen multitasking, you hold down on the Recents button *from within an app* (don't tap it, and don't press it when you're on the homescreen.) Then, you can pin one of your other open apps beneath it.
Two caveats: it doesn't work for full-screen games, and some apps won't work properly (Google Maps) unless you tap on them.
The biggest thing we don't know about Nougat is when cellular carriers and manufacturers (you know, other than Google) will roll it out. We'd love for this whole table to be filled with Nougat-y new devices...but when? Stay tuned.