Google has already started applying Material Design on many of their apps. Recently they rolled out Chrome Browser for Android v37, which is still in Beta, having Material Design user interface. And now here is the all new Google Play Store with the same new UI. This is version 4.9.13 of Play Store which you will find completely different from earlier. Seems like it is meant for the upcoming Android L update.
Apart from the User Interface, Google has also provided many new features in this version such as the app descriptions is now available in full screen, also the version numbers and apk size is also in full screen. There are many more changes, as you can see in the image below. So, its time to upgrade this new Play Store to your device, as it has still not reached to many devices and in many regions. You can download the latest Play Store APK from here in one simple click.