Apple released iOS 7.0.4 Thursday, an update to address a specific FaceTime Bug. Apple's patch notes also mention unspecified bug fixes and improvements.
Those sparse patch notes:
Bug fixes and improvements, including a fix for an issue that causes FaceTime calls to fail for some users.
iOS 7.0.4 Release Notes
The update is available as an over-the-air (OTA) download or through iTunes. It's a 37.6MB download over-the-air.