Apple adds iCloud support for AirPort Base Station and Time Capsule with the release of Firmware Update 7.6.1 on Monday January 30th, 2012.
About AirPort Base Station and Time Capsule Firmware Update 7.6.1
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.
Apple also released AirPort Utility 6.0 for Mac OS X Lion and AirPort Utility 5.6 for Mac OS X Lion.