Yes, Apple TV has an available firmware update, bringing the Apple 'hobby' device to version 3.02. No reason for the update is given, and no new features are listed.
It's likely an update to allow Aperture 3 to work with it, but really, we don't know and Apple ain't talking. If you have an Apple TV you can force the update by going to the settings menu, or wait until the auto updater gets around to reminding you. Either way you'll get an update that ... uh... well, really, we don't know what it does.