I've noticed after upgrading both my iPhone 5s and my iPad mini (gen 2.) that I've lost over 1.0gb of user storage. The iPhone is down to 26.6gb and the iPad was at 26.8gb until I reset the device and lost another 500gb (down to 26.35gb). I'm am leaning toward filing a bug report on my dev account and I first want to know if anyone else has different numbers to mine. I used the iTunes metho to update both devices. I've not updated my iPod touch yet and that is currently at 28.0gb.
Also to the iPad users, have you noticed that when you restart your iPad it asks for a passcode since it restarted (mine does; I don't recall this from iOS 7).
Also to the iPad users, have you noticed that when you restart your iPad it asks for a passcode since it restarted (mine does; I don't recall this from iOS 7).