It isn't clear to me if they are imminently about to push an update with new features or if they are just going to announce "there it is, enjoy!".The current myChevrolet app has a map feature that shows charging stations. I can see Superchargers, Nissan, Honda(!), and BMW dealers. It does kindly point out that the Superchargers are incompatible, when selected. It does not show my nearest two GM dealers. There are no EV-specific navigation features.
In any event, I was told they planned to make some announcement about it before the first customer delivery and that should be imminent.