There probably isn't much. The icon showing a magic mouse might infringe a trademark, though; Apple tends to trademark icons where practical, which is likely why TouchWiz scrapped its very iOS-esque icons a while back.
We aren't using the magic mouse icon. It's a hand-drawn svg, although I agree it looks pretty similar.
Here's the icon at a larger size: http://i.imgur.com/Hnc53Yd.png
Can you suggest specific aspects of our OS that would judged to be too similar to Apple's products so as to warrant a claim of infringement, other than a general aesthetic similarity and the color of our window borders?