updated 03:05 pm EST, Thu December 15, 2011
Changes so far unclear
Apple has released two minor firmware updates for iOS devices. The first is v4.4.4 for the Apple TV, which implements unspecified bugfixes. The update can be installed automatically via an Apple TV's normal update functions, or manually by technically savvy users with access to the IPSW file.
Unusually, Apple has also published a slightly different version of iOS 5.0.1 for the iPhone 4S. The new build is listed as 9A406. Why Apple would push out such an update is unknown, although any changes are likely to be extremely small given the same version number, and the need for compatibility with apps.