Windows 8 definitely goes Metro. Here are some quotes from recent post on MSDN: http://blogs.msdn.com/b/b8/archive/2011/09/02/reflecting-on-our-first-conversations-part-2.aspx

We’ve seen a clear turn where Aero is the past and Metro is the future. And with that a strong desire for the existing Windows experience to take on a new look or a Metro redesign. These comments are usually focused on style and looking “old” or “new.” Generally, those details of the visual styling come later in the engineering process…

And:

For Windows 8, Metro style means a new type of app—an app that learns from and improves upon the current (and most popular) platform.

I don’t think there is any doubt that Metro design is firmly in Windows future…