The software update iOS 5.1 is now available for existing iOS devices. The most interesting features are Japanese language support for Siri, camera enhancements, and the ability to delete photos from users Photo Streams and lets not forget about the battery issues iOS 5 users are experiencing, the iOS 5.1 update takes additional steps to address that issue.

This update contains improvements and bug fixes, including:

– Japanese language support for Siri (availability may be limited during initial rollout)
– Photos can now be deleted from Photo Stream
– Camera shortcut now always visible on Lock Screen for iPhone 4S, iPhone 4, iPhone 3GS and iPod touch (4th generation)
– Camera face detection now highlights all detected faces
– Redesigned Camera app for iPad
– Genius Mixes and Genius playlists for iTunes Match subscribers
– Audio for TV programs and films on iPad optimized to sound louder and clearer
– Podcast controls for playback speed and a 30-second rewind for iPad
– Addresses bugs affecting battery life
– Fixes and issue that occasionally caused audio to drop for outgoing calls