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