I have no inside information on the subject... but I have said it before, and again, and will now say it for a third time:

While the costs of building such a player will no doubt drop between now and then... given the current investments that Microsoft is making in the existing 360 platform & ecosystem... I’d be flabbergasted if they were to be any eighth generation console in 2012, let alone from Microsoft... doubly so if the economy is still struggling (which it will be). 2015 (*maybe* 2014) is the earliest I would expect to see Microsoft release something in the 8th generation.

As a consumer/gamer, it'd be neat, sure... but speaking as a pragmatic, it simply isn't going to happen.