The Mac Observer reports that Apple has released Airport Utility 6.1 on Monday to add support for their just updated Airport Express.The new version also adds support for managing IPv6 settings.
Apple has also released the Airport Utility 5.6.1 for Mac and Windows, with support for the new Airport Express. The older version of the utility allows users to fall back to the more traditional interface, instead of the graphical interface that some users have expressed dislike for.
The updates are available via the Software Update application, or as downloadable installers at the Apple Support website.