http://arstechnica.com/gadgets/2015/11/offline-navigation-comes-to-google-maps-for-android/ (http://arstechnica.com/gadgets/2015/11/offline-navigation-comes-to-google-maps-for-android/)
The update is being pushed today, so it will be wise to wait on testing until tomorrow.
I'm sure the ES uses are self-evident (I've been using backcountry navigator pro as my offline map system for exercises, having a default app will be nice to make things easier for people to use.)