I'm willing to bet that they went with what was ready to demo, rather than what they have planned. The stuff they've displayed seem fairly simple all things considered. However, I think they have a problem, what with twenty ways of doing things. Expose, Mission Control, the Launch Pad, the Doc, App folder, Spotlight, Spaces.
However...
Mac App Store will be huge. Their is every reason to think this.
Touch interfaces: it's not so much touch as reacting to touch inputs. This is already accomplished in an abstract way with a mouse. Left and right click, moving around, scrolling the mouse wheel. This is a continuation on what's been happening already. Personally, I think this will be really nice for apps. I already use touch features for navigation where I can, and it's frustrating when an app doesn't support it.
However...
Mac App Store will be huge. Their is every reason to think this.
Touch interfaces: it's not so much touch as reacting to touch inputs. This is already accomplished in an abstract way with a mouse. Left and right click, moving around, scrolling the mouse wheel. This is a continuation on what's been happening already. Personally, I think this will be really nice for apps. I already use touch features for navigation where I can, and it's frustrating when an app doesn't support it.