Android 7 Bringing More Security

It looks like security will be a big focus for Android 7 "Nougat", from file level encryption to media server hardening. They also plan to incorporate "seamless updates", a feature currently used in Chrome OS.

I hope it does not slow down my older Nexus 7 tablet!
Google has improved security in Android Nougat in a handful of different areas. Some are designed to harden Android itself, while others are tools for developers to use so it stays that way when we install apps.
Android Central