Google I/O conference will start tomorrow at the Moscone Center in San Francisco which will be attended by developers from all over and it is being expected that Android 4.1 Jelly Bean will make a debut along with the much rumored 7 inch Google Nexus table.
Google I/O keynotes will start at June 27 at 9:30 Am and you can watch live telecast at https://developers.google.com/events/io/io-live and in YouTube http://www.youtube.com/GoogleDevelopers.

A statue of Android Jelly Bean has been placed at Google’s Mountain View campus lawns marks the official announcement of the latest OS.

It is also being expected that Google Play Store UI will change for all Android devices when Jelly Bean will be launched tomorrow.
An Italian blog Hdblog has received a photo of Samsung Galaxy S III running a new version of Google Play Store.

The new Interface looks similar to that of Apple App Store.
Will update you more on Android Jelly Bean and New UI of Play Store tomorrow with keynote of Google I/O!