The operating system had been confirmed for PCs (obviously) and tablets, so far.
Says Ballmer: "We are driving Windows down to the phone with Windows 8."
Because the operating system will also be somewhat integrated to the Xbox 360, the OS will unify all of Microsoft's platforms for the first time ever.
Windows Phone will likely not be identical to its tablet and desktop counterpart but will most likely share the same NT kernel.
There is a debate as to whether Ballmer just misspoke (didn't pause long enough to separate sentences but guess for yourself):
Written by: Andre Yoskowitz @ 15 Nov 2011 17:47