My 2 cents.
1. if there was indeed no driver's cluster, I'm certain there would at LEAST be a hud overlay.
>extra credit: imagine the autopilot display as an overlay...with augmented boxes around cars etc like an AC30 gunship (plus the augmented part). That would be pretty...what's the word....badass.
2. The positioning of the 15" screen, especially it's upper left corner seems to be almost directly in your line of vision. Doesn't seem as out of the way as the Mini gauges...
3. As far as the busy UI design, they said that will be changed some before production.
4. the floating screen design allows for less volume of the dash, giving more legroom etc.