For those of you that have one of these devices, the update should be available from Apple's Website from 19H00 tonight:
http://www.apple.com/iphone/softwareupdate/
http://www.apple.com/ipodtouch/softwareupdate.html
http://www.apple.com/iphone/softwareupdate/
http://www.apple.com/ipodtouch/softwareupdate.html