iOS 5.1 adds some minor improvements and interface tweaks to Apple's mobile OS. CNET takes a closer look at exactly what the update brings.

Of course, Siri will answer back in Japanese, as well. In the penultimate line we asked Siri for her name. She responded in kind.

The familiar camera shortcut that we got from iOS 5 now will appear on the lock screen at all times.

Also, instead of pressing the camera icon you must now slide up the lock screen to expose the camera app.

With iOS 5.1, the camera now will highlight all faces that it detects with a green rectangle.

In the iPad's camera, the shutter control has moved from the menu at the bar at the bottom of the screen to the right side of the viewfinder.

iPad users also get new controls for controlling the playback speed and rewinding in 30-second segments. We take assume no responsibility for the content of this podcast.

AT&T iPhone 4S users will see a new "4G" icon when their phone is connecting to the carrier's HSPA+ network. Whether that really counts as 4G, however, is another question.

Apple's new iOS 5.1 seems to be getting better grades at preserving battery life. But not everyone is happy.

A glance at Apple's Support Communities uncovered a few threads on the topic.

Some posters found an improvement in the battery charge. One recounted a full day of activity using the phone and said "I've had days of not doing anything and lost more charge than this." Another reported positive results with a "significant improvement." A third poster said that the "iOS update seems to have really helped my iPhone battery drain issues."

You'll see this screen as you download 5.1 through a wireless update.

Another screen will show you the full list of iOS 5.1 updates, at least those that Apple is telling us about. There should be more additions, so we'll be looking for them.