As spotted by u/ChrisSDreiling on Reddit, it appears that one of the changes we can expect in Apple Maps in iOS 15 is the factoring in of weather conditions and warnings. As you can see in the screenshot, it shows the user alternate routes that they can take if they want to avoid potential flash floods.
Given that not everyone drives trucks or cars that wade through a flood, this is actually a very useful feature to have, as people in the comments have pointed out. Also, it helps people make a decision whether or not they want to go out or stay home and keep safe. It’s interesting that Apple did not mention this feature at WWDC 2021 when they unveiled iOS 15, but it’s pretty cool.
iOS 15 is currently scheduled for a release in the fall, possibly alongside the new iPhones, although we don’t have a specific release date yet.