A leak on the BroncoNation forum showed changes for the 2023 model year (which are very minimal), and the roof was on then. This comes after years of delays. Initially, Ford sent out an email stating that the black painted roof would instead be optional, then delaying the item until 2022.
Frankly, now was the time, and the writing was on the wall for the option. Ford recently showed off the Bronco Heritage Edition, which came with a white roof. It’ll be an option for the 2023 MY, so it makes sense that Ford would show that now, ready to offer painted roofs more broadly than to roll out sooner or later than the 2023 MY.