According to Microsoft Win 8 is designed as touchcentric from the bottom up
which says it's designed around a touch screen, and they added on some mouse and keyboard capability etc as well.
Now, since Microsoft tell me their product is designed around a touch screen, I have very little reason to think they're lying to me about it - but then, they do lie about so much other stuff, so they may be lying here as well as part of their marketing push, and you could be right.