Nexus 5X Android 8.1 Update: What's New
Google's December Android 8.1 build comes with a solid list of patches for security vulnerabilities. If you're interested in the specific patches, be sure to check out Google's Android Security Bulletin located right here.
As for Android 8.1 itself, Google's upgrade delivered a nice list of changes including tweaks to Autofill and Notifications.
Android 8.1 also delivers a colored nav bar in Settings that dims, a new power menu design, a new Oreo icon in System Notifications, and automatic dark and light themes. Some of these come from the Pixel 2's software.
Google's also fixed the hamburger emoji in Android 8.1. On Android 8.0, the cheese sits below the patty. On Android 8.1, the cheese is layered on top of the meat.
For more on Android 8.1 Oreo, take a look at out guide.