None of my iOS 8 devices will wifi sync. But my iOS 7 devices sync fine (always have).
I have three devices running iOS 8
iPad Mini Retina iOS 8.0.2 -- iPad 3 iOS 8.0 -- iPhone 5s iOS 8.0.2
None of these devices Wifi sync. However, they all used to Wifi Sync at version 7.x.x.
I also have two devices running iOS 7
iPad 2 iOS 7.x.x -- Phone 5 iOS 7.x.x
Both of these devices are currently Wifi Syncing with out problem.
Because my ver. 7 devices are currently syncing, I have to assume the problem is with iOS 8 or some combination of iOS 8 and iTunes.
My computer is an early 2011 MacBook Pro with the latest version of Mavericks. iTunes also has the most recent update.