Interpretation of a leaked Microsoft job post leads to conclusion that the Xbox 720 would be released in February 2014 at the earliest.
A job post leaked ( has been removed now) on Microsoft that had the following passage in it according to Slashgear: "Over the next eighteen months Microsoft will release new versions of all of our most significant products including Windows (Client, Server, Phone and Azure), Office and Xbox."
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The internet immediately jumps to the conclusion that this means that the Xbox 720 comes in 18 months. I think this is very thin evidence to make that conclusion. I also do not see February 2014 as ideal for launch a new console. Microsoft will for sure chose a fall release date. In my mind the new Xbox comes Fall 2013.