If your mobile device is running Android 4.1 or higher, consider yourself lucky, as you today get access to the latest version of the Google Search app.
With the updated version, you can now play music -- either songs saved on your device or from Google Play -- by issuing a voice command. In addition, if you have a hard time remembering what voice commands are supported, the app now offers voice action tips to remind you.
Lastly, the Search app also comes with new Google Now Cards that show Google Offers and information about TV shows. Conveniently, Google Offers cards will pop up when you're near a store, which should increase the likelihood that you'll redeem the offers. As for the TV Cards, you must have an Internet-connected TV on the same network as your Android device to get them to show. From there, you can tap "Listen for a TV show" to get actor bios and other relevant information.
For devices running Android 4.1 and higher, the new Google Search app is available now on Google Play.