Below are the official Change-log of Google App v7.20.15 Update:
What's New? (Below are the official change-log which we are re-sharing from the official blog)
• Use voice commands while navigating – even when your device has no connection. Try saying "cancel my navigation" "what's my ETA?" or "what's my next turn?"
• Weak connection? If your search fails, the Google app will deliver you results once you regain connection.
• Troubleshoot connectivity issues with more helpful error cards when your search fails because your device is offline
• New customization options available for cards in your feed
That's It for the update.
Note : The app will support to all Android 4+ Devices and you need to be beta users for this update.
Go through the below link to download the Google Search app v7.20 APK file