Actually, the volume bar is replaced by whatever the iPod is outputting audio to if the volume isn't controlled on the iPod end. For example, my Bluetooth headphones' name is there when I use them to listen to music now.
Kinda makes sense, since the iPod volume doesn't effect the volume of the audio going through the dock connector and/or Bluetooth. Also, the Bluetooth and dock connector control issues still remain, so you can't adjust the volume from the dock with headphones plugged in at the same time (for non-speaker dock devices like wireless remotes), and the forward/back buttons don't work over Bluetooth.
On-The-Go playlists can once more be edited (it used to crash if you tried to edit more onto it), and the button that should say edit is cut off ("E..."). Oh, and you can close all Safari windows/tabs now (including the last one!), but a new blank page just pops up when you do.