Nexus 5X devices that are arriving at the homes of Android fans today are receiving a small 42MB update almost immediately out of the box. The build is arriving as MDB08I, which is a build first seen as a factory image earlier in the week.
Tough to know what’s new in it, but it’s likely just a day 1 bug fixer of some sort.
If you own a Nexus 5X and haven’t seen the update yet and you are currently running build MDA89E, you can download it here from Google. If you need help sideloading OTA updates, hit up these instructions.