Apple has released beta 3 of it’s iOS7 and it is available for download right now.
They included a bunch of improvements and bug fixes. See the release notes (unofficial) with all the changes made to this new beta release of iOS7.
If you are running iOS7 beta 1 or 2, you can update by simply going to Settings > General > Software Update on your device. The download/update is 214Mb which is considerably small and the mirrors are very fast so it shouldn’t take long either.
Enjoy it and feel free to comment with your findings!