Microsoft has just released the Developer Preview of Windows 8 - which can be grabbed from http://msdn.microsoft.com/en-us/windows/home/.
One thing that drives me up the wall is the trend that OS developers seem to follow; not all users are high school kids who spend their whole time on social networks. Think of the power users dammit! I can't imagine having a very productive work flow on Windows 8. Hopefully I won't ever be forced to use it extensively - I have only just grudgingly gotten used to Gnome shell.
Yes, I am getting old.