A while ago, there were some articles about Windows 9/10 being a cloud based operating system, resembling Google's Chrome OS. Well, now there is more news coming from Mary Jo Foley of CNET with details about the future of the operating system in this article.
The gist of the article is that Microsoft has been working on an operating system code-named "Midori", that utilizes the cloud instead of being based on previous versions of Windows, since 2008. It is being written in a new language, M#, which is an extension of the C# language.