Apple just pushed out an update for iOS, bringing the version number up to 5.1.1. The update thus far appears to be primarily bugfixes including tweaks to HDR from the lockscreen camera shortcut, stability switching between 2G and 3G on the new iPad, and other issues. The release notes are below from the update information. 

We're grabbing the OTA update on our devices (for the 4S the update is around 54 MB, for the 4 the update is around 48 MB) in addition to the full ipsw. As usual the links to the update images directly can be found at the awesome iOS-e-lite page for the impatient. We'll update with any notes about major changes beyond what's in the notes above.