Considering the large short position that has been increasing over the last week, I raised my estimates to $20+ minimum a day or two after approval occurs. I figure a quick pop on approval, and then a climb to higher levels once you get the "sell the news" crowd out.
My post is only my opinion, I recommend you always do your own DD! I am not a licensed broker or a professional by any means, so take what I say as entertainment value at best.