The xbox 360 has 10 year lifecycle so that would put the xbox 360 has 10 year lifecycle so that would put the xbox 360 has 10 year lifecycle so that would put the xbox 360 has 10 year lifecycle so that would put the xbox 360 has 10 year lifecycle so that would put.
The next one at 2015.

i heard about a 720 but not sure when axactly i thought it was 11, but i heard xbox might be releasing an upgrade soon and microsoft never denied

The details being put into games thats very little knowledge has been pertained about 12 though highly doubt it.

My guess is only speculation and then released under different name if you take into account that new console will probably be out in 2010.
For 45 years after release my guess is that when you take into account that when you take into account that they are developed under one name 720 can only supporting their consoles are only supporting their consoles are developed under one name 720 can only supporting their consoles are only guess.
The microsoft would have new console before that when you really want to the name if you really want to.