It’s been released on the same day as iCloud.
You can get it from the App Store here.
I’ve added some screenshots below:
The diagram looks similar to Windows’ Network Connections page showing the Internet connected to the base station. Upon clicking the base station, you get general info on the white box.
Click Version leads to a firmware options page with the ability of update the base station’s firmware. Wireless Clients gives you a list of current clients. Going deeper, you get connection details for each device, etc.
Apple is made Airport Utility for iOS easy for novices to use, yet powerful enough with ample stats for those with the need.