Today, Apple released iOS 4.4 for the Apple TV 2G. Apple did not release an official iOS 5 update for Apple TV users as expected.
As noted by the folks over at Electronista, Apple did however release iOS 4.4 for the Apple TV. This update adds iOS 5 features, but is still called iOS 4. This update adds AirPlay mirroring, Photo Stream, and Movie Trailers. Apple also added some third party apps, such as an NHL app and a WSJ app for video consumption.