Apple has released AirPort Utility 6.3 for Mac (http://tinyurl.com/m69fen7). It’s a 21.43MB download and requires Mac OS X 10.7.5 or later.
Use AirPort Utility to set up and manage your 802.11n and 802.11ac AirPort base stations, including AirPort Express, Extreme, and Time Capsule. AirPort Utility 6.3 allows you to configure and manage the new AirPort Extreme and AirPort Time Capsule with 802.11ac Wi-Fi, and includes enhanced remote management capabilities.