Wireless sync. No more USB cables. More TV . video options. Apple has all sorts of options - i'd imagine it's in line with their plans for QT and iTunes for SL
+1 on this. I think they'll also include a built in 'simplify' type feature that allows you to stream music from a friend's itunes library. An update to the remote application so that you can choose to play your friend's music on your home stereo from your iphone would also be a welcome addition and an improvement over the 'simplify' application.