Double BINGO! This network reset tip worked for my iOS 8.0 device. Now when I fire up iTunes on my Mac, it is able to list both my iOS 7.1.2 and iOS 8.0 devices. Noticed a few things during the network reset performed on the iOS 8.0 devices. They the following:
1. Removed all the iOS 8.0 device's network settings, wifi and mobile networks (this is expected and users will be able to reinstate quite easily for their primary wifi, i.e. work or home networks, however, it would have flushed out all the special SSL enabled wifi settings using profiles, so will still need to reinstate these and might not be straight forward for users).
2. It changed the name of iOS 8.0 device! Noticed that immediately when the device showed up in iTunes.
3. iTunes had some difficulty locating the iOS 8.0 device while the device is in sleep mode (i.e. screen off). Had to hit the home button to wake it up and then it showed up in iTunes.
Other then the above, I think Wifi Sync with iTunes for iOS 8.0 devices should be good to go!
Manuel, thank you very much for your tip/trick to get Wifi Sync with iTunes in iOS 8.0 working again, greatly appreciated!