Android Police has a great little preview of what we can expect from the next version of the Google Play Store.
Play Store 5.0 will reportedly feature a bevy of Android L-optimized animations, along with a new colour palette for the various sections, including Apps, Books, Movies & TV Shows, Music and Newsstand.
The new version will be functionally identical, but will reportedly have a more granular app restore process for those with new Android devices. For example, if using a new tablet, the Play Store will prompt you to restore all saved apps or just those relevant to tablets.
Source: Android Police