The Google Now Launcher is powered by Google Search and provides flight information, WiKi answers, restaurant guides and more. However, there is no official word from Google about its availability for non-Nexus devices at the moment.
If you don’t want to wait until the Google Now Launcher is officially released on the Play Store, you can easily side load it using the GoogleHome.APK file. After the installation, don’t forget to set the Google Now Launcher as your default launcher to access its services. Source