iOS 5.1 : New Camera Icon
The camera icon now lives on the lock screen in iOS 5.1. Simply swipe up to enter camera mode.
iOS 5.1 : New Siri Language Support
Siri has learned a new tongue: Japanese. You can fire it up on an iPhone 4S right now, but it isn't ready for use. Yet. It's coming soon.
iOS 5.1 : Optimized Audio
iOS 5.1 brings improved audio to movies and television programs to iPads. In our tests, we didn't detect a change.
iOS 5.1 : Photo Stream
You can now delete photos from Photo Stream, which is a long overdue addition for fans of that feature.