Didn't see this info out there yet -- a Scout employee confirmed that a steel metal roof will be available and production models will also have roof rails (this was absent on the concepts).
Great news about the steel roof version. The glass roof and retractable cabana top are nice options to give owners choices, but I would pick a standard metal roof if I was going to be hauling cargo on the roof top. Higher roof weight limit and also just less complex / prone to damage / easier to repair.