Maintaining the basic shape of a saddle, the Shark introduced a 'fin' at the rear which is designed to improve your power, decrease rotation and promote correct posture when riding.
The proposition is that sticking a dagger board in your crack will reduce or eliminate pelvic roll. In fact, if you are correctly fitted to your bike, you won't experience a problematic degree of pelvic roll anyway.
Can anyone explain the purpose of this saddle to me?