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I suspect we won't see a pano roof in Model 3 for a couple of years, solid roof will arrive with the base SR 3.
I thought this was something I would really want until I rented a Model S for the weekend and decided I just liked the glass roof better- much quieter and you can still see out. I'm someone who has traditionally loved sunroofs and has a Miata (the ultimate sunroof ).
probably a solid roof on the base $35K model when they release that...and probably see 17" wheels with narrower tires for better range on the small battery