Earlier in the week it was reported that iOS 5.1 might be getting a new camera button on the lock screen and support of Japanese in Siri. BGR is now reporting that they were able to get a hold of the alleged iOS 5.1 GM release, and have confirmed these new features.
I always like hearing about the new features in iOS. The last few releases have blown me away. They are getting closer and closer to a perfect operating system. All they need to do is keeping looking at the jailbreak community for suggestions.