Apple has released iOS 6.1.2 which is the latest update for iOS 6. Majorly, it is a bugfix version which fixes a lot of bugs and incorporates a few enhancements. iOS seems to be available for all the Apple devices including iPhone 4, iPhone 4s, iPad, iPod touch etc.
If you have a jailbroken Apple device then you will need to download the IPSW file and update your device via iTunes. Here are the direct download links for iOS 6.1.2 IPSW files.