While you were out standing in line for an elusive gold iPhone 5s, Apple quietly rolled out the latest Apple TV update.

Unlike previous updates that added new channels, version 6 of the Apple TV firmware goes under the hood, adding support for Apple's iTunes Radio streaming service for those in the US, allowing purchases from the iTunes music store, supporting podcast syncing, and providing access to shared iCloud Photo and Video Streams. Additionally you can stream purchased iTunes content via iCloud to any Apple TV, even when it isn't currently using your iTunes credentials.

Plus, Vevo is now available on Apple TV in the UK.

Above: Our Apple TV following the update. We've had no problems with the update so far.

The update, which was released on Friday, was pulled on Sunday following a series of reports from users who were experiencing networking issues and permanent bricking making it completely unusable. Some users also said that they lost the content on the device during the update.

However, Apple re-released the update on Monday, and seems to have squashed the bugs, so it's now available for Apple TV users to download and install.

Here's what's new.

Apple TV 6.0: Purchasing music

In the past you've been able to purchase videos directly from your Apple TV. Now you can do the same with music. Just select the Music entry, navigate to an album or track you wish to purchase, highlight its price, and press the remote's Select button to purchase it. You'll be asked to confirm that you really want to purchase the song. Confirm that you do and the track will be made available to the devices associated with your Apple ID.

Apple TV 6.0: AirPlay From iCloud

This feature is nearly transparent. Here's the idea.

You're visiting a friend and you have an iOS device with you. You go to the Videos app on your iPhone, iPod touch, or iPad and you look for a movie that you've purchased from the iTunes Store. Tap on it and select your pal's Apple TV to play it on.

Within the Apple TV's AirPlay settings is a new Play From iTunes In The Cloud setting that's set to Auto by default. When you configure your iOS device to stream its content to the Apple TV via AirPlay and then tap a movie on iCloud to play, Apple confirms with the iOS device that it's authorized to play that content. Once authorized the Apple TV will play it, but not streamed from the iOS device but rather streamed from Apple's servers. You can then switch to another app on your iOS device or even put it to sleep. But you can't quit the host application--Music or Videos. If you do, playback on the Apple TV will stop.

Apple TV 6.0: Podcasts

The Apple TV will now sync podcasts between itself and iOS devices. Any podcasts you've subscribed to on other devices will now appear on your Apple TV when you select Podcasts from the Apple TV's main menu. Additionally, play points are remembered. So if you've listened to only half of a podcast episode in the car, you can pick up where you left off in the living room.

Apple TV 6.0: Improved Photo Stream viewing

Finally, the latest Apple TV provides an update to Photo Stream that enhances shared streams. You can now comment and "like" images within a shared stream - even if it's your own stream - directly on the Apple TV. You can't, however, delete or add images in a shared stream on the Apple TV.

Unlike some earlier updates, this one is not installed automatically. To obtain it, choose Settings > General > Software Update. Over a 4-mbps DSL connection the update took approximately 15 minutes to download. The installation process took easily as long.

Apple TV 6.0: iTunes Radio on Apple TV

(Note: This is only for US users. There is currently no word yet about when the feature will arrive in the UK)

Launch the new iTunes Radio, wait a while as it loads, and the iTunes Radio screen appears. Along the top are Stations, Add Station, Edit Stations, and History headings. Choose Stations and you'll see a row of Apple's preconfigured stations (playlists) and then the My Stations entries below. Just as with iOS 7's Music app, you add stations by clicking an Add Station button. This produces the Add Station screen where you can select a genre and then sub-genre - Alternative > Indie > Rock, for example, and highlight and click a plus (+) button to add the station.

Alternatively, on the Add a Station screen highlight and click Create a Station and in the resulting screen type in the name of an artist, song, or genre; select a matching station; select and click it to add the station; and start it playing.

On the Now Playing screen you can start and stop playback with the remote's Play/Pause button. To see additional options, press and hold the remote's Down button. Do this and you can access the Play More Like This, Never Play This Song, and New Station From Artist options.

Navigate to the Edit Stations screen and you can enable or disable the Explicit Music option as well as select a station and click the Trash icon next to it to delete the station. If, instead, you highlight the station and click you find options for tuning the station (choosing between Hits, Variety, and Discovery), Play More Like This (artist, song, or genre), Never Play This (artist, song, or genre), and Delete Station.

Choose History and you'll see those tracks you've played as well as have access to your Wish List. All the data you find within the Apple TV's iTunes Radio area is synced over iCloud from other devices, which explains why you need to be running iOS 7 and iTunes 11.1 (along with OS X Lion or later) to use it.

Again, as with iOS 7's Music app, you can purchase tracks within most of the iTunes Radio screens.