After running Windows 8 related sites for such a long time. Finally I found that I can’t find “Windows 8″ in “Browser & OS” – “Audience” of Google Analytics.
Yet, I find that “NT” is listed as the top OS in my Google Analytics. So I guess Google considers Windows 8 as Windows NT 6.2.
However, this kind of configuration gives us no exact result. Hope Google correct it soon.