Well, this one's an ambulance-chaser class action. And there's certainly no evidence yet to give it any merit.
There definitely won't be a class-action from the patients who were taking the drug, as it was really helping a lot of them, all of whom were suffering from a terminal disease.
If there's any class action from the patients, they'd sue to get it back on the market.
Edit: Though I value the company substantially north of its current price, I think the run of the past two days has gotten way ahead of itself. It needs to pull back and try again, more slowly this time.