“Windows 8 reimagines Windows for a new generation of computing devices, and will be the very best operating system for hundreds of millions of PCs, new and old, used by well over a billion people globally.”
If you want to know about Windows 8 from official sources, straight from the people building this new version of Windows, here’s the recently started official Blog- Building Windows 8 or simply B8 . http://blogs.msdn.com/b/b8/
This blog by Steven Sinofsky will provide an inside look from the Windows engineering team. This blog will post regularly throughout the development of Windows 8, and focus on the engineering of the product.
The primary goal of this blog is to have a two-way dialog, so comments are an important part. So you can right away comment on the blogposts providing valuable inputs to the Windows 8 team.
Check out- already there are very interesting blogposts.
Also if you want notifications of posts then be sure to follow @BuildWindows8 on twitter.