Google does seed OEMs with update code before that.Of course, beyond the fact that this adds to the growing info that Jelly Bean is coming soon, it also shows that Google has been giving developers access to the Jelly Bean SDK. We would hope that this means manufacturers are also seeing the code, which could mean quicker updates. People tend to take the date that Google puts the code in the open source repo as the day that work starts on upgrades, but we know that
Other than the telling update for Pandora, the app has gotten various bug fixes and updates to the settings and registration options in the app. If you're looking for Pandora, it's available for free in the Google Play Store.