Android O feature spotlight: There's now a progress bar for sideloading APKs
Android O feature spotlight: There's a cool new animation when opening or closing notifications
Android O feature spotlight: Android System is already using notification channels
[Update: Any notification can be compacted] Android O feature spotlight: Persistent notifications are more compact
Android O feature spotlight: Automatically enable WiFi when you're near a saved network
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There are some cool things you can play around with in the Android O preview, but some of the most useful features won't be available until developers start implementing them. For instance, the new notification channel feature. As it turns out, Google has already implemented notification channels in the Android System. That means you can get a feel for how it'll work.
Android System notifications appear when you need to be alerted about some core feature of the OS. They might show up in the event of an OTA update or when a new storage device is connected. In the case of Android O, they also appear when an app is drawing on top of the screen. That's how we stumbled upon the use of notification channels in the preview.
So, how does it work? When you long-press on a notification, there's an option to see "All Categories." That takes you to the settings for that app where you can turn notifications on and off for each channel implemented by the developer. Additionally, you can make changes to the importance level of each channel or control whether they appear on the lock screen. You can set one type of notification to make noise while all the others only appear silently, for example.
This is something we'll see a lot more of when developers can start publishing apps targeted at Android O. That'll be rolled out in a future version of the developer preview.