Windows Vista has everything, a new GUI, new features and also things that yes will be missing that will get shipped later. So at least the promised things will happen. Vista is like a bolt-on OS allowing Microsoft to take it forward since its life-span will of just started. XP is heading toward a point where 'not much more can be done with this' specially if Microsoft say so
With Vista taking so long to hit us, has it stepped on Vienna's toes? Will people want a whole new OS again?
Personally i think Vienna could be an amazing project IF microsoft take it seriously. If they used the resources they could create a whole new OS and take the OS market by storm.