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This could be the start of something really interesting...
How I see it evolving? Well, I'd like to see something equivalent to a mix between Apple's Siri and Google's Glass, but directly onto the windscreen and rear windows whilst in the car, giving dedicated and individual functionalities to the driver, front and rear passengers.
Thanks for directing me to the thread on the Model S Google Glass app. However, this thread is aimed at the wider discussion of future TESLA HMI... Google glass like interface is only one possibility I mentioned to introduce a farther reaching concept of on-windscreen / on-window interface.