Objects are highlighted when the pickbox cursor rolls over them, providing a preview of which object will be selected when you click. Pretty cool stuff. You do have some options related to how this function works, or you can even turn it off.
In the Options dialog box under Selection is the following new area.
You can set it so that highlighting of objects is done only when a command is active or not. Seems like they could have handled this with one check box, but I am not the programmer so what do I know.
The Visual Effects Settings button does even more.