Google updated its Google app, which includes the Google Now Launcher, with some small tweaks on Wednesday. If you're using a Nexus device and haven't installed a third-party launcher app, such as Action Launcher 3 (or similar), you're already using the Google Now Launcher. On other devices, such as Samsung's Galaxy line you have to explicitly enable Google's launcher in the device's settings menu.
One such addition is the ability to enable auto rotate for your Android device's home screen. Meaning, you can rotate an Android smartphone from portrait to landscape when viewing any of your home screens and the interface will adjust to accommodate the device's orientation. As Droid Life notes, the update also seems to have adjusted the size of some app icons in the app tray.
To enable auto rotate, you'll need to download the latest Google app update from the Play store.
Once its installed, long-press on the home screen and tap on Settings. At the bottom of the list, you should find a toggle switch to enable Auto Rotation. Slide it to the On position, then go back to your home screen. Rotate your device and enjoy its newfound versatility.