Along with the notable iOS 6.1 update Monday afternoon, Apple also released a software update for the Apple TV. Firmware version 5.2 adds support for streaming songs from iTunes in the Cloud, updates support for viewing and choosing tracks on iTunes' new Up Next feature, and includes previously rumored support for using a Bluetooth keyboard to control an Apple TV.

If you have an iTunes account registered with your Apple TV, the latest firmware will allow you to access, browse, and play back all music previously purchased via iTunes. The feature, which Apple calls "iTunes in the Cloud," has been available via the desktop and iOS devices for some time, but now you can access this content directly from an Apple TV. It doesn't appear that the feature works with iTunes Match at this time.

You can also use your Apple TV in conjunction with iTunes 11's Up Next feature. Support had actually been added in the interim firmware version 5.1.1 in November, but the latest version includes compatibility to view the Up Next list. You can add or edit songs using an Apple Remote or the Remote app on iOS.

The new update also adds support for connecting wireless Bluetooth keyboards. While the update's notes say it supports the Apple Wireless Keyboard, it in fact works with any standard Bluetooth keyboard. Arrow keys work as on the Apple Remote, while return works as select, escape works as menu, and space works as play/pause.

Apple hadn't yet updated its online knowledge base article about Apple TV software updates with full details of the 5.2 firmware at the time of publication, but we expect any additional details to appear sometime this afternoon.