While this is interesting and somewhat exciting news, I'm really concerned about feature parity. OneNote for Win10 is still a very long way from the desktop OneNote 2016 in terms of feature robustness (and arguably stability as well) - the gap is in all the details we rely on everyday using the desktop version of the app - sometimes very basic features we now take for granted are noticeably missing in the 'settings' of the OneNote app. If the OneNote app can be made of equal features with the 2016 desktop version then users will gladly switch over to the newer technology without any issues, else probably only new and more casual users will be on the OneNote app, while more hardcore and legacy users will just stick to the desktop version for the next few years, until it catches up (if it ever does).