Actually, it might have been in one of the other sessions in WWDC, I’m doubting myself now, I know in the keynote they said the new map updates are expected to be done in the US by the end of 2019 and then expend to other countries from 2020 (37:55 into the keynote), and think that was then expanded on in another session that this was about the new look to maps (topography, etc) and so that Look Around falls into that category. Apologies, as I wasn’t totally accurate in my other post, but the information is out there if you look for it.
They did say that, but that refers to the owned mapping data, not necessarily additional iOS13 specific features like Look Around. Look Around is a separate layer of the new Maps and as we have seen already with the exisiting rollout, it will not necessarily be on the same schedule. No different then the launch of other features like Flyover/3d satellite views, transit details, internal maps, etc.