Google announced Google Nexus 7 at Google I/O along with the latest Android 4.1 Jelly Bean.Google has also announced a new Play Store version which is faster and includes the option to buy magazines, movies, and TV shows.However, the latest Google Play Store 3.7.11 is available for Nexus 7 and Galaxy Nexus.
XDA forum member has downloaded and made lastest Play Store available to all.
You can download the latest version on your device just like any other APK and enjoy.
Download Google Play Store 3.7.11 APK