Today, unexpectedly for iOS users, firmware 5.1.1 has been released. The update does not contain any "new products", past problems are fixed, and there are improvements.
Updates
Improving the reliability of using the HDR option for photos taken using the shortcut icon
Correction of errors that could prevent the switching of a new iPad between 2G and 3G networks
Correction of errors under certain circumstances affecting video playback using AirPlay
Improved synchronization reliability of Safari bookmarks and Reading List
Correction of the error that could lead to displaying the warning "Could not buy", despite the successful purchase