While we're waiting for shipping, the official users guide is now online (found via 9to5mac.com):
http://itunes.apple.com/us/book/ipod-touch-user-guide-for-ios-6/id568425614?mt=11
http://itunes.apple.com/us/book/ipod-touch-user-guide-for-ios-6/id568425614?mt=11