If you skipped iOS 13.1, iOS 13.1.1, iOS 13.1.2, iOS 13.1.3, iOS 13.2, and iOS 13.2.2, you get a useful upgrade to Apple Maps in your iOS 13.2.3 update.
The iOS 13.1 update had some new features on board including a popular feature that was pulled from the iOS 13 beta over the summer.
Share ETA is an extremely useful feature if a) you use Apple Maps and b) you are often traveling to meetup with friends, family, or co-workers.
With iOS 13.1/iOS 13.1.1/iOS 13.1.2/iOS 13.1.3/iOS 13.2/iOS 13.2.2/iOS 13.2.3 on board, you can now share your ETA to a location with someone. In turn, the other person can then follow you on your journey.
It's an extremely useful feature if you live in an area where traffic, or weather, can change in a heartbeat.