The New Xbox One Experience update is now rolling out to Microsoft's latest console, clocking in at 1.1GB. If you've selected the Instant-on option on your console, the update will download automatically in the background. Else, you'll have to manually head into Settings – System – Update Console to initiate the download.
If you're not willing to install the update right away, Microsoft has mentioned that it will roll out the new interface as a mandatory update on November 23. The update brings a new UI that's twice as fast, along with a laundry list of features and improvements, most notably backwards compatibility.
As a reminder, Xbox 360 backwards compatibility will go live at 12:01PM PT, 3PM ET, 8PM GMT, or 1:30AM IST on Friday.