It's an infant grassroots "thing", so it isn't actually solidified with goals yet. I've been following the twitter hashtag #occupywallstreet and TheNation's blog by Greg Mitchell on it. There are a few very informative articles on it's origins and what it isn't. Here's one.
BusinessInsider
Here's another:
AmpedStatus
One thing about the protests and having a PR firm working for them pro-bono, is that hopefully, the average citizen will start asking questions and go inform themselves. Information and knowledge are power and way too many people just blindly buy the rhetoric they are fed by the media and those in power.