iOS 7.1.2 Changelog
iOS 7.1.2 was released on June 30, 2014. The build number is 11D257. The update does not break the recently released Pangu jailbreak.
Here are the official release notes:
• Improves iBeacon connectivity and stability
• Fixes a bug with data transfer for some 3rd party accessories, including bar code scanners
• Corrects an issue with data protection class of Mail attachments