I like the 'flush screen' idea and only wish they would make the screen a wee bit larger (like Aura HD). Page turn buttons are of no attraction to me, especially if they require much pressure.
I would like to think that glass would scatter less light than the plastic light guide layer does now, and preserve more of the contrast/sharpness and have less susceptibility to uneven lighting. OTOH I'd be a little worried about potential damage—my PW does fine without a cover but glass might need one. With a cover, any weight savings will be offset.
I don't think a light sensor would work well enough. At least it doesn't on the devices I use that have one. Still need to manually adjust for best results. But they could make it easier to adjust the light (a swipe up/down on left edge of screen, for example, like some tablet reading apps do).
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