Today, Motorola's Assist app on the Google Play Store has been updated with a few new features. Assist can determine your actions, such as driving, sleeping, and perform a pre-specificed command.
Until today, the app could only read you the text messages you received while driving. With the newest update you can now reply to texts while driving by speaking to the phone. Once the text is read to you, you will have the ability to read a response to the app.
In addition, Assist can also launch your music player of choice when it notices you are driving.
The update is available on the Google Play Store. Motorola Assist is only compatible with Verizon Wireless' most recent Droid line-up, as well as the Moto X.
Source: Google Play Store