I'm not sure who's seen the Movie Real Steel yet, i actually watched it for the 2nd time over this past weekend and saw this ad on 1 of the boards there: , so i googled this and found out that they are actually planning 1, cant wait to see that! i actually thought it was just a rumor....
Good find you have a keen eye there, wonder why they had an advert for the next Xbox in there already? Its not officially announced yet, however it is expected to be at E3 later this year.
That will be awesome to see hey! wonder what spec's they gonna introduce on this 1? would love to see that hey? and the cats obviously out of the bag now, because, Microsoft must've given them the go ahead to place go through with that Ad, so then it definitely is confirmed, just wish they wouldn't be so secretive about it.
It's probably more that it's a movie set in the future with brands like Cadillac and Coke, although its funny only Xbox got a future spin on it.
Both the console and any sort of name have never even been officially announced yet. Very unlikely it will be called 720, Xbox 720 only comes about as people think 360 * 2 when thinking of the next Xbox.