The Google Play Store has been updated to version 4.0.25 and the update is now reportedly rolling out to Android. We've seen the version of this store in previous leaks and the new design looks to unify the Play Store with the rest of Google’s products. It also shows inspiration from Google’s card based UI presented in Google Now.Additionally the images are more prominent and the app are larger, which shows the store has been better optimized for touch. Google also claims that the checkout process has now been ‘simplified’.
The update will be automatically pushed to your handset when it is available for your device. Meanwhile you could also consider downloading a leaked version of the apk below.
You will need to be running Android 2.2 or higher in order to install this version of the Play Store.
source – Android Blog | XDA Developers