I think I'm going to make an FAQ as I know this will be a major pain point for new owners. Not because of Honda; rather the fragmentation between different smartphones and operating systems. The above link explains things well. You get music, audio, navigation, and voice commands for simple actions.
The only limitation is how quickly app developers can make their product compatible with the Google/Apple standard. They don't flip a switch; they have to recode the app interface to ensure the display is oriented in landscape mode and all controls accept Bluetooth touch commands from the HU.