Having hb and cronies destroy ariads reputation, positive scientific updates will not do much for share price movement. However, positive updates can lead to a more aggressive negotiation towards a potential buyout, if one were to take place.
With limited financing, news resulting in a pop in share price, would be a result from the market seeing such news as interest to an outside party.
With the overwhelming and logical route for the company to move forward in a buyout, or even a partnering, Why else would any true long continue to invest in ariad? Hint: they wouldn't.