Apple just released iOS 6.1.4. This update as an audio profile for the speakerphone. It has a build number of 10B350 and appears to only be for the iPhone 5.
Do not update if you device is jailbroken and you plan to keep your jailbreak. Currently only iOS 6.1.2 is jailbreakable on all devices.
Here is the direct download link if you are interested in updating and losing your jailbreak:
- iPhone 5 (GSM) (iPhone5,1) version 6.1.4 (Build 10B350), Download
- iPhone 5 (CDMA) (iPhone5,2) version 6.1.4 (Build 10B350), Download