Apple has released iOS 6.0.2 for iPhone 5 and iPad mini. The release notes for the iPhone note only that an unnamed Wi-Fi bug has been fixed.
iOS 6.0.2 Software Update
This update contains improvements and bug fixes, including:
• Fixes a bug that could impact Wi-Fi
For information on the security content of this update, please visit this website:
The update can be downloaded via Software Update in Settings or via iTunes.