It won't happen. Sorry to burst your guys' bubbles. Just because it's a new system does not mean that they are using a different systems that withholds all of our GamerTags. The console itself is new, improved, and has up to 3 different operating systems on it, but nevertheless, all you are doing is recovering your GamerTag onto the new console.
Think about that as well for the people who only want one console on your account. If you are that type of person, you will have to create a new tag on the Xbox One platform then swap your OG's onto it.
GL Everyone.