Despite the fact that the old saying goes, "Where there's smoke, there's fire", I agree, it is too soon for specifics.
However, it does give us something to chat about whilst we await the arrival of Windows 8.:D
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These are the dates that were leaked:
Here is a PDF format copy of the document leaked by Chris Green the Ex MS employee.;)
http://img.hexus.net/v2/news/microsoft/microsoft-roadmap-leak.pdf