We have already seen the Android L apps including the keyboard which can be downloaded right away. Now, Google has released the new Android L Play Store interface for everyone which is based on the Material design of Android L.
Google is slowly rolling out the new Play Store version 4.9.13. with new interface and it might take a few days or at-least a week for you to get it. But, for those of your who want to get their hand on to the new Play Store can download and install the Play Store apk file right now.
Simply download the updated Play Store apk from the download link at the end of the article and install it like a regular apk file (see details here to install apk files).
Once downloaded and installed, you will be able to use it like regular Play Store app but, this time you will see the all new Material Design from Android L.
– Download Play Store apk v4.9.13 with Android L Material design (Android File Host Link)