Apple has updated its free Remote app today to version 4.2.
The app now boasts greater integration with Apple TV — users can now control iTunes Radio through the set-top box using the app, and you are now shown your iTunes Match music and iTunes in the Cloud music/TV show/movie content within the app, merely tapping on the screen to play it through the currently selected Apple TV.
In addition to these changes, the update features bug fixes and stability improvements.