TUAW posted a story that Apple has released iOS 6.0.2, which promises an unspecified fix to WiFi usage
If you've been having issues with WiFi, you'll want to see about updating right away. Most of us on the TUAW staff have been getting error messages when checking for the update using over-the-air updates. If you run into that, try updating through iTunes.Apple releases iOS 6.0.2 with WiFi fix