Apple has released Apple TV Software Update 5.0.2 for 2nd and 3rd generation Apple TV models. The release has build number 9B830. Apple has yet to update the Apple TV Software Update webpage with details about the update.
The Apple TV can be updated directly on the unit by going to the Settings menu, then General, then selecting Update Software.
The last Apple TV update was released less than a month ago.
Update: Apple has updated its support document to indicate that the 5.0.2 update addresses a single issue related to parental controls.
Parental Controls: Addresses an issue which caused content restrictions to be incorrectly applied for the iTunes Store in Australia.