Despite the feature's association with iOS 4.3, Apple has already begun approving third-party apps with support for AirPlay video, reports say. While video has technically been a feature of AirPlay since iOS 4.2, only the forthcoming v4.3 firmware will unlock the option outside of iOS' native video player. The technology can push video to a second AirPlay-compatible device, which currently means the Apple TV unless using an app like AirView.
