maybe not superscope but untill it happens otherwise I really wonder how many people(past the hardcore, they don't want the hardcore they want casual market nintendo has) will buy it. The other side is games, will the games be good, hwo many games will be made, it's not so bad if your a big name stuido(though having to do special natal/psmove controls will add to game costs) but smaller studios will have to see if it's worth it to them to put out titles for it, the install base will never be more then what... 50% at best? and thats if they start out just putting it in every xbox (they won't, there will still be a low end model that comes without it)
Maybe I'm wrong and people will flock but will it be the people they want or do those people already have a wii and if they do why change? There's a good saying that if you are trying to get into a market when it's already blown up your already too late.
There's also the chance that they are trying to do this instead of launching a new system to try and push that back futher since I havnt' heard a damn thing about the ps4/xbox 720.