This is speculation. Personally, I'd be surprised if Windows 7 was released before 2012. Vista, while a bit resource-hoggish, is still the most streamlined and versatile OS out there.
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And yes, it's most definately speculation. Though from what I've heard (and this is all just second hand from reading things on Cnet and such) I thought that they were shooting for a release some time late this year, and at the latest sometime in the first half of 2010. Though the main gist of that statement was just to say that Arenanet has already said DX10, and hence Vista, won't be required for GW2.