Nice idea, I wonder what thickness the panes are and how many layers of whatever make up said pane ? I might be off with my judgement, but most of the aircraft such features would be placed in, would transport persons of high wealth who generally prefer to be more discrete.
No doubt there will be the ability to 'mist' the glass as is evident in some 5star hotel suites, though it would be interesting to know if sections of the pane could be darkened or only the whole area of the pane.