AirPort Utility has been updated to both version 5.6 (latest one was 5.5.3) and 6.0,the latter available now as 14.3 MB download in Software Update. Whilst 5.6 is a minor update that "resolves an issue with using network passwords stored in the Keychain" and "works with AirPort Express 802.11g and AirPort Extreme 802.11g base stations", AirPort Utility 6.0 is a major rewrite of the application that now resembles its iOS counterpart released in October of last year.
Above: AirPort Utility for iOS 5 on iPad. Below: the new AirPort Utility for Lion.
We'll update this story with more details and screenshots in a few minutes. In the meantime, you can find the download links below. Apple also updated the AirPort Base Station and Time Capsule firmware, which reaches version 7.6.1 and brings the following changes:
This update is for all 802.11n AirPort Express, 802.11n AirPort Extreme and Time Capsule models. It fixes an issue with wireless performance and provides support for remote access to an AirPort disk or a Time Capsule hard drive with an iCloud account.