Here's how you can upgrade your iPod Touch to iOS 6 via Wi-Fi. No need to connect your iPod Touch to iTunes. 1. Open the Settings app. 2. Tap on General. 3. Tap on Software Update. 4. Install your iOS 6 upgrade on your iPod Touch.
For more, see the original article at the link below.
iOS 6 Has Been Released, Download Now! | OS X Daily