I don't know squat about writing software and may be totally bonkers here, but I think Blue is an optional addition to 8 Modern UI to address multitasking for business (and others) using MS Store apps instead of legacy programs on the desktop, which I think will be phased out once apps are written. It will be multi-paning much like a picture-in-picture television. One will be able to open as many apps as one needs to use. This might be the new "Windows reimagined".
Imagine the possibilities. It will be much like the invention of the Start Screen with live tiles updating at intervals. One may have, let's say, a "live pane" with a clock and weather. Another one for email. Another for stock ticker. Another for People app. Another for Calendar. Another for interoffice communication. Whatever one needs to tab through to work on. Of course all this depends on screen real estate.
Let's say one may drag a pane over to another monitor to work on. Perhaps two. One may be able to configure or personalize this "new personalized multipane desktop" to open at boot just like the Start Screen.
I think MS did a fine job catering to any one of the keyboard, mouse, touch pad, touch screen with finger, or whatever one prefers to navigate with on their first approach. Can it be improved? You betcha', just as all things can.
This all may not happen until 9. All in all, I believe Modern/Metro interface is here to stay and will continue to be the future of MS computing.
Another thing is that companies could easily have apps written specifically for their own needs.
Also remember that the legacy desktop is now a portal of the new interface.
Oh that old hippie has some crazy ideas doesn't he?!!