Some interesting tidbits here. Microsoft has trademarked a ringtone that also appeared in leaked Surface Duo developer promo. So, it seems that it may be the signature ringtone for Surface Duo.
Coming to the next interesting tidbit, you can check Windows 10X OOBE or the boot-up animations and steps in the video below. Though it is not complete but it does pack some new and interesting animations.
Here's the OOBE of Windows 10X (well, at least the first few pages, it breaks after EULA, which is probably why it was disabled)
It packs some pretty animations pic.twitter.com/SwrGqhVKDx
— Albacore (@thebookisclosed) February 11, 2020
Windows 10X will pack a new music control UI as revealed on Twitter.
New music control UI on Windows 10X pic.twitter.com/rUJIgmhTft
— Zac Bowden (@zacbowden) February 11, 2020